#1 - The Secret Base 8.62
Season 2 - Episode 6
Laura appears in the nick of time to protect Ichika and Madoka flees. Some time later, Charlotte is assigned to perform some escort job and with the other girls all busy, Ichika offers himself to assist her. While dealing with some attackers, Ichika protects Char from an explosion and back at the academy, his Byakushiki is confiscated after displaying some abnormal behavior. With instructions to not fill the others about it, Char decides to watch over Ichika by herself as long as he is defenseless, but she comes into another predicament when her panties vanish mysteriously. Charlotte then discovers that changing her underwear does not solve the problem as it vanishes as soon as she puts it on, thus she is forced to keep going commando even at the risk of Ichika figuring out. Noting that something is wrong with her, Houki, Cecilia and Lingyin manage to have her reveal all the truth and the three start fighting for the right of becoming Ichika's bodyguard until Tatenashi appears to reprimand them for causing a commotion inside the school. Just when Charlotte decides to reveal the truth to Ichika, Laura appears and confirms that her panties had returned as the interference causing malfunctions of both Ichika and Charlotte's IS had subsided. Back at their room, Laura points out to Charlotte that all her troubles could be averted if she had put on a bloomer instead of panties, much to her chagrin.
#2 - Find Out My Mind 8.56
Season 1 - Episode 8
The match between Ichika and Charles against Laura and Houki begins where Laura focuses on fighting Ichika and pays no heed to her partner Houki, who is soon knocked out by Charles. Ichika and Charles uses their teamwork to take advantage of Laura's AIC shield to defeat her despite Ichika's shields running low after using Yukihira. With her defeat imminent, Laura reminisce her past of being a failed genetically engineered soldier unable to adapt an IS until meeting her teacher and role model Chifuyu but hates Ichika upon learning Chifuyu shows her softer side because of him. Not wanting to give up, Laura goes berserk which transforms her IS into a large, dark IS. Wanting to stop her, Charles gives her remaining IS power to Ichika to manifest Yukihira and uses it to strike the dark IS and free Laura. As Laura recovers and learns who Ichika fights for, Chifuyu explains what cause her IS to go berserk and consoles Laura to not follow in her footsteps but to choose her own path and be who she really wants to be. Despite the inter-class tournament being cancelled, Ichika decides to go out with Houki anyway. Later at the newly-opened boys' public bath, Charles tells Ichika that she will stay at the Academy under her real gender and name, Charlotte. When the class learns the truth about Charlotte, Lingyin in anger arrives to punish Ichika but is saved by Laura. However, Laura suddenly kisses Ichika in front of the girls and tells him he is going to be her "Wife", much to the shock of everyone.
#3 - Lovely Style 8.52
Season 2 - Episode 5
By request of his teachers, Ichika is drawn to an event where each of the girls are allowed to provide service for him for a limited amount of time. Initially, Houki stumbles while performing a Japanese Tea Ceremony to him, followed by Cecilia who plays billiards with him while wearing a bunny suit. Charlotte then serves Ichika some cookies while dressing as a poodle but is taken away for going too overboard on her service and Laura plays darts with him with some intimate items of hers as prizes. Before Lingyin's turn, Tatenashi appears to join the party and teases Ichika wearing a cat suit. Before the end, Chifuyu appears dressing as a maid to serve him and it is revealed that it was all part of the birthday party they had prepared to him. When asked about which one of the girls acts he liked best, Ichika chooses Chifuyu's instead, just to be scolded by them. After the party, Ichika is approached by M, who introduces herself as Madoka Orimura and is about to attack him.
#4 - Sisters 8.50
Season 2 - Episode 7
Tatenashi watches over her younger sister, Kanzashi Sarashiki, who is feeling gloomy since her personal IS was delayed due to the development company focusing on Ichika's IS. Ichika and Houki are invited to be put on exclusive magazines for personal IS pilots; during the interview, Houki exaggerates that Ichika is willing to protect her. Later tonight, walking down the hallway, Ichika, wondering about the girl, Madoka, from before, and asks Chifuyu if they have any other relatives, claiming he is her only relative. Tatenashi entrusts Kanzashi to Ichika for the upcoming tag tournament. All of the girls interested in Ichika, plan to partner with him; however, Ichika responds that he plans to partner with someone else, Houki and Cecilia assume he implying to one of them. Ichika plans to partner with Kanzashi. Following through, Ichika visits Class 1-4 only to be turned down by Kanzashi.
#5 - Girls Over 8.47
Season 2 - Episode 12
Madoka appeared before Ichika, piloting the Black Knight IS. Tatenashi engages Squall on top of a tower at full combat. On a malfunction monorail that Chifuyu and the following students are trapped in, they deduce a time-bomb is attached to it, so Kanzashi quickly calculates the bomb’s whereabouts. As Ichika fights Madoka while reaching the train, Houki and Cecelia are attacked by Autumn and eventually rejoin Ichika, to see the train’s explosion. Having Ichika devastated, Madoka stabbed him fatally, leaving Houki to save him and cries for his awakening. Luckily, Charlotte, Laura, Huang, and Kanzashi detained the bomb just in time. In a dream, Ichika is seized by Madoka, but then a mysterious girl in white hair gives Ichika a helping hand. Squall has the other IS pilots vulnerable, until Tatenashi diverts her with a weapon of hers and signals for Ichika's instigates attack in White Knight form. Madoka intercepts Ichika, though he manages to strike her down, Phantom Task evacuates for now, prompting they have collected enough data, and Ichika is welcome by everyone else alive and well. A scene is shown Tabane sitting beside the mysterious girl. In a hot spring, Ichika relax while thinking about Madoka's pendant that had Chifuyu's picture. Just before Ichika leaves the bath, the girls suddenly start coming in because a person mistakenly changed the sign from male to female, to their embarrassment.
#6 - Your Name Is 8.46
Season 1 - Episode 12
While the girls fight Silver Gospel, Ichika has a dream where he meets a young girl and a warrior woman who asks him if he wants strength, which he agrees as he wants to protect his comrades. As the battle continues to rage, Houki manages to cut one of Gospel's wings and sees it fall into the ocean, only for it to re-emerge in its Second Shift form with "angel wings" and proceeds to to take down Houki and the rest. Houki is soon awakened by Ichika, who is now in Byakushiki's Second Shift form, Byakushiki Setsura, and gives Houki a hair ribbon as a gift as he still remembers July 7th as her birthday. With their combined strengths, Ichika and the girls finally defeat Gospel, with Ichika giving it the finishing blow. As they return back to their hotel, Chifuyu scolds them for defying orders but allows them some R&R as a reward for stopping Gospel. At a seaside cliff, Chifuyu has a talk with Tabane and believes she was the one who made Ichika the only male to pilot an IS and was behind the incident that discovered it, but Tabane reveals what happened with Ichika was a coincidence but admits she was the one responsible for hacking Gospel to go berserk in order to debut Houki's IS to the world before Tabane vanishes. At the beach, Houki apologizes to Ichika for his injuries and admits her feelings for him. As they are about to kiss, Ling, Charlotte, Cecilia and Laura arrive, angry in what they are seeing, which forces Ichika to run away with Houki in his arms from the other girls.
#7 - Ocean's Eleven! 8.41
Season 1 - Episode 9
Houki calls her sister, Tabane, who reveals she has completed an IS called Akatsubaki just for her. After being hassled in the morning by Laura, Ichika goes with Charlotte to the mall to buy swimsuits for their beach study session while Lingyin, Cecelia and Laura stalks them. When Charlotte notices them following her, she hides with Ichika in the dressing room to show off her swimsuit, but they are both discovered by Chifuyu and Maya. During the beach study session, the girls try to get close with Ichika with various results. As sunset arrives, Chifuyu talks with Houki about Tabane and believes her sister will come with the Akatsubaki IS on July 7.
#8 - Open Your Heart 8.40
Season 2 - Episode 8
Persisting Kanzashi to be his partner, Ichika looks up on maintenance assistance for Kanzashi's personal IS, but it's not that simple. Meanwhile, upon realized Ichika insisting to pair with Kanzashi for the tag tournament, the girls take their time training more aggressively. As Tatenashi has Houki to team up with her, she analyzes Houki's physical body, to her surprise to learn that her aptitude is up to level S already. When Kanzashi takes her IS, Uchigane Nishiki, for a test run, it malfunction, then Ichika saves her before she crashes. Having a change of heart towards Ichika, she indirectly agrees to be his partner. Then Ichika shares data from Byakushiki to help improve Kanzashi's IS, and haves other students to gladly help. Returning to his dorm room, Tatenashi insist Ichika for another massage, talking how important younger siblings can be for their elders, knowing how strict they can be for their protection. Kanzashi having to give Ichika sweets as gift, she reaches his door only to overhear that Ichika’s generous offer was Tatenashi's idea, leaving her heartbroken.
#9 - Class Representative Selection Match! 8.34
Season 1 - Episode 2
Ichika is told by Chifuyu that he will be provided with his own personal IS for his match against Cecilia, a rarity since there are only 467 IS Cores that were created by Tabane Shinonono, Houki's older sister before she disappeared. To prepare himself, Houki agrees to train Ichika by practicing Kendo. On the day of the match, Ichika is given the IS Byakushiki against Cecilia's IS, Blue Tears. Cecilia has the advantage at the beginning as her IS is a Sniper while Ichika IS is a Close-range fighter but Ichika manages to transform his IS into First Shift, the IS second form and pulls out an energy sword. Just as Ichika is about to strike Cecilia, the match is declared over and Cecilia the winner because Ichika's energy sword completely depleted his IS shields. Despite losing, Ichika agrees to train more with Houki while Cecilia is unsure of herself despite winning the match.
#10 - Blue Days / Red Switch 8.32
Season 1 - Episode 7
Houki becomes pressured to win the upcoming inter-class tournament after her attempt to ask Ichika out escalated into a rumor that whoever wins the tournament gets to date him. As Cecilia and Lingyin prepare to spar, Laura appears and goads them into a two-on-one battle, effortlessly countering all their attacks. When she continues to beat them at the risk of their lives, Ichika and Charles step in to rescue them before Chifuyu puts a stop to the battle, declaring it will be settled in the inter-class tournament. It is soon announced that the tournament will be conducted in pairs, with Ichika choosing Charles as his partner. On the day of the inter-class tournament, it is decided via lottery that Houki is to be paired with Laura against Ichika and Charles.
#11 - My Roommate is a Blond Gentleman 8.28
Season 1 - Episode 6
After losing against him in a practice bout, Ichika has a training session with Charles, which is interrupted by Laura who wants to fight him, but refuses. On his way back, he spots Laura talking with Chifuyu, begging her to return to Germany and that the IS Academy doesn't deserve her, but the latter doesn't listen. It is revealed when Ichika was kidnapped during the 2nd Mondo Grosso IS championship, Chifuyu forfeit the finals in order to rescue him. Upon returning to his dorm, Ichika walks in on Charles in the shower to discover he is actually a girl. Charles reveals she is her father's illegitimate daughter who was taken in after her mother passed away and made an IS test pilot. But when the Dunois corporation entered a financial crisis due to the demand for third generation ISs, Charles was ordered to act as a boy to give the company publicity and steal data from Ichika. Sympathizing with her due to his parents abandoning him and Chifuyu, Ichika decides to keep Charles' secret as she'll be safe at the IS Academy due to Diplomatic immunity. Meanwhile, Laura, who blames Ichika for blemishing Chifuyu's record removes her eye-patch, revealing a golden left eye and swears revenge on him.
#12 - Decisive Battle! The Class League Match 8.28
Season 1 - Episode 4
Ichika and Lingyin battle in the Inter-Class IS Tournament but their match is interrupted when a mysterious IS attacks the arena. As Ichika and Lingyin hold off the IS so the audience can escape, they soon realize the IS is an unmanned drone due to it's machine-like behavior. Together with Cecilia, the three of them manage to defeat the IS but not before it injures Ichika. As Ichika recovers while Lingyin watches over him, Ichika wonders the promise he made with Lingyin had a different meaning which the latter quickly denies. Meanwhile, Chifuyu and Maya examines the defeated IS and confirms it is an unmanned IS drone with a unique IS Core that didn't come from the 467 confirmed Cores the world has which makes them question who made it.
#13 - My Classmates are All Girls 8.23
Season 1 - Episode 1
Ichika Orimura is attending the Infinite Stratos Academy as he is the first male to ever pilot an IS where he becomes a sensation among the all female students of the academy. With his homeroom teacher being his older sister Chifuyu, an ex-IS pilot, Ichika is in unease and unprepared and trying to get use to the academy. Later he learns his dorm roommate is his childhood friend, kendo champion Houki Sinonono, who he has not seen in six years. When his class decides to elect him as their class representative, the British cadet representative and noble, Cecilia Alcott is against it and challenges him to an IS duel for the position.
#14 - Cooking My Way 8.17
Season 2 - Episode 10
The girls are shown sitting down at the cafeteria questioning Kanzashi's relationship with Ichika. Kanzashi replies with "We're just friends." but secretly has feelings towards him, which all the girls then reflect that upon themselves since their all in the same boat. Later that day Ichika is called to the nurse's office by Maya, where she then tells him that due to the recent attack the IS-suits must be improved. Maya then tells him the "Student Council" asked for Ichika himself to do the body measurements. After the debacle the group is on the roof eating lunch where Ichika is shown with a bento made by Houki. When Ichika mentions how he loves everybody's cooking, Cecelia becomes upset considering she can't cook whatsoever! When everyone went back at their dorms Cecelia goes to Houki for help on how to make good fried chicken. With deep remorse she decides to help Cecelia anyway. When Houki gets a call and leaves the room, Cecelia purposely adds perfume and mustard to the chicken for "touch", where Houki then taste-tests it. The next day Houki is shown absent (due to Cecelia's absurd concoction). Cecelia then goes to Charlotte for help and they start to make Charlotte's famous "pot-au-feu". When Laura is tossing in her sleep due to bad dreams Charlotte goes to tuck her in and leaves Cecelia to her own accord where again she purposely adds her "touch" to the dish (Laura is shown waking up hungry and then eats the dish). The next day Houki, Charlotte and Laura are shown absent, Cecelia asks Ichika if just him and her could eat lunch on the roof the following day, where he agrees. Finally Cecelia asks Ling for her help, Ling who has technically figured out what Cecelia has been doing tells her to try her "own" food, but sure enough Ling ends up tasting Cecelia's sabotaged dish. Cecelia meets Ichika on the roof, but due to her making everybody sick and not even keeping a single dish, Ichika then brings her to his dorm where they make Rice Balls. The episode ends with Tabane eating a fancy dinner with Squall (the blonde woman who is part of Phantom Task). Tabane notices how Squall was trying to drug her through soup. Autumn is then shown pointing a gun at Tabane's head where Tabane then knocks the gun out of her hand and severely injures Autumn by knocking her into a wine case. Silent Zephyrs busts through the cafe and attacks Tabane, but she easily disarms it. Tabane shows an interest in Madoka after disabling Silent Zephyrs so she makes an exception to only make a personal IS for her.
#15 - What It Takes to Be a Hero 8.13
Season 2 - Episode 9
Heavily depressed of her sister's doing, Kanzashi skips school today. Tatenashi announces the opening tag tournament at the school assembly, while Ichika goes looking for Kanzashi who's thinking how incompetent she is. Then a sudden raid, is launch onto the arena by five anti-IS units. Chifuyu commends the Personal IS pilots a combat attack. One unit lands before Kanzashi when Ichika saves her. Kanzashi activates her IS and both battle the anti-IS. Tatenashi and Houki charge spear-strike onto their anti-IS, but its armor prove too much to penetrate, thus an explosion occurs. Ichika goes to check on the scene when Kanzashi detects Tatenashi is unconscious and fights in rage at the unit until her IS weapon power runs out. Believing it's hopeless, Tatenashi protects Kanzashi and gets fatally injure. Deep within subconscious, Ichika and Tatenashi encourage Kanzashi that no matter how weak you are…a hero should never run away…and accept your well-being. Houki replenishes Ichika's energy. Kanzashi uses a charm that Tatenashi lead to her and they destroy the anti-IS, while the other units are destroyed as well. Recovering in the infirmary, Tatenashi begins to see how reliable Ichika can be and feels for him, while she and Kanzashi have a friendly sister-to-sister talk. Meanwhile, they managed to recover two of the advance anti-IS Cores, as Chifuyu decides to notify the government. Later, Kanzashi gives Ichika an anime movie as a gift, and she confesses her love to him and ran, but realizes she mistranslated that she loves anime.
#16 - Heart Pain Killer 8.00
Season 2 - Episode 2
After sparring with Lingyin, Ichika runs late to class and is punished by Chifuyu. Officially meeting Tatenashi at the school assembly, Ichika oversees the selection of his class' activity for the school festival wherein Laura suggests a normal maid cafe. After receiving approval, Ichika is unwilling to receive Tatenashi as an instructor and challenges her ultimately losing. Dreaming upon the grasslands, Ichika appears to see Houki before awaking in Tatenashi's lap. Tatenashi takes Ichika training in shooting stances with Charlotte and Cecilia. Ichika returns home to find Tatenashi who incites Houki as he enters into a new training routine with Tatenashi. In the end Houki, Cecilia, Lingyin, Charlotte, and Laura all try to comfort Ichika as he falls asleep from exhaustion.
#17 - Boy Meets Boy 7.96
Season 1 - Episode 5
Houki has been given her own room by Maya and leaves in anger when Ichika is being dense about it but makes him promise to go out with her should she win the grade level individuals tournament, which spreads into a rumor that the winner of the tournament gets a date with Ichika. At the same time, a transfer student, another male IS pilot from France named Charles Dunois, arrives much to the joy of the girls of the Academy due to Charles's Bishōnen looks and "interest" with Ichika, who also becomes his new roommate. While Ichika's class has IS practice with Lingyin's class, Chifuyu has Lingyin and Cecilia battle against Maya in a Rafale Revive IS, a 2nd generation IS made by Charles' father's corporation, which Maya easily defeats Lingyin and Cecilia's more advanced ISs. While Ichika is having lunch with Houki, Lingyin, Cecilia and Charles, the girls try to give Ichika their lunches which he enjoys Houki's the most and feeds some of it to her much to the other girls' anger. The next day, another transfer student from Germany named Laura Bodewig, an acquaintance of Chifuyu's, arrives much to the surprise of the class. Laura immediately walks to Ichika and slaps him, declaring she will not recognize him as Chifuyu's brother.
#18 - The Transfer Student is a Second Childhood Friend 7.87
Season 1 - Episode 3
Cecilia takes a liking with Ichika and gives the position of class representative to him instead much to Houki's chargin. The next day, Ichika meets Lingyin, the new transfer student from China who also happens to be his childhood friend and also the class representative of her class. After Ichika and Lingyin get reacquainted with each other, Cecilia and Houki get jealous and coached Ichika in IS practice very hard. Upon learning Houki is Ichika's roommate, Lingyin tries to get Houki to let her become his roommate instead which Houki refuses. But Lingyin later leaves in anger after Ichika doesn't figure out the childhood promise they made and wants to settle it in the Inter-Class IS Tournament. With his match against Lingyin and her Shenlong IS next, Ichika prepares himself.
#19 - The Mysterious Lady 7.82
Season 2 - Episode 4
Reiko unleases Arachne revealing herself to be Lady Autumn from Phantom Task. After detaining Ichika, Reiko reveals that it was Phantom Task who captured Ichika during the Second Mondo Grosso while she forcibly attempts to take Byakushiki. Upon arrival, Tatenashi is seemingly killed while Cecilia and Rin engage BT Second, Silent Zephyrus. Revealing the speared Tatenashi to be a water-based copy, Tatenashi along with her IS, Mysterious Lady, engages Lady Autumn. As Ichika pursues Lady Autumn, he is intercepted by Silent Zephyrus who successfully deters him, Houki, Charlotte, and Laura allowing Lady Autumn and herself to escape. Maya briefs Chifuyu on Phantom Task revealing that Silent Zephyrus was the second Blue Tears stolen from England while Chifuyu reveals that Tatenashi's true objective was to train and guard Ichika. Unknown where, Autumn berates a woman resembling Chifuyu for her interference while Squall intervenes simply addressing the other as "M". As M awaits her revenge while staring at a locket containing the photo of Chifuyu, Tatenashi reveals to Ichika her purpose of protection. Tatenashi also reveals what Ichika's crown really meant as the stays with him.
#20 - Get Ready 7.75
Season 1 - Episode 11
As Ichika and Houki begin their operation, the others notice how happy Houki looks, which prompts Chifuyu to tell Ichika to watch over her carefully. As Ichika and Houki engages in battle with the Silver Gospel and is about to corner it, Ichika notices an illegal fishing boat in the area and breaks off formation to protect it. Houki is angry at Ichika for ruining the plan but he scolds her for disregarding the boat's safety, which is something she never does. However, the Silver Gospel launches a surprise attack on them, which forces Ichika to shield himself to protect Houki. As the critically injured Ichika is admitted, Houki blames herself on what happened and wants to quit being an IS pilot but Cecilia, Lingyin, Charlotte, and Laura manages to convince her otherwise. Together, they decide to defy Chifuyu's orders to stand by and go after the Silver Gospel themselves.
#21 - The Translucent Chord of Cinderella's Heel 7.75
Season 2 - Episode 3
Tatenashi extorts Ichika for a massage before he butlers for his class' maid cafe the next day. Stopping by the cafe, Rin orders a set wherein she has to feed Ichika personally. Disheartened after Houki interrupts her attempt to be fed by Ichika, Rin eats the pocky and is complemented as being cute. Realizing it is in comparison to a squirrel, Rin storms off leaving Reiko Makigami asking Ichika to use her company's equipment. As Ichika goes on break, Cecilia, Houki, Charlotte, and Laura all try to join but Cecilia wins out taking him to the brass band exhibition. Returning, Ichika is abducted by Tatenashi to be the prince of the student council's rendition of Cinderella wherein, unbeknownst to him, whomever gets his crown receives the right to live with him. Under constant fire, Ichika manages to survive Rin, Cecilia, Charlotte, Laura and Houki only to be pursued by the walk-in contestants where he is dragged under stage by Reiko who desires to steal Byakushiki.
#22 - Looking for Memories 7.72
Season 2 - Episode 11
The IS class goes on a leisurely field trip with the girls vying for Ichika's attention. While leaving, the class is attacked at their various locations by Phantom Task.
#23 - Thin Red Line 7.64
Season 1 - Episode 10
After catching the girls listening at their room while Ichika is massaging her, Chifuyu has a talk with the girls about their feelings for her brother and gives them some advice. The next day, Tabane arrives to personally deliver to Houki the Akatsubaki, a fourth generation model with abilities far more advanced than the others. However, Chifuyu soon receives news that an an unmanned IS called the Silver Gospel has gone out of control. After assessing the situation, Chifuyu orders the group to stop it, while Ichika and Houki will pursue it, as only they would be fast enough to catch up with the Silver Gospel.
#24 - The Memory of a Summer 7.63
Season 2 - Episode 1
The episode begins with Ichika in a dream similar to the one he had in the last episode of the first season. However, this time when he looks to the woman in the IS who he thinks is his sister, she grabs him and strangles him while saying 'I'll kill you'. Ichika then wakes up and finds Laura sleeping with him once again, but this time she has 'clothes' on. Laura asks Ichika to the new amusement park to end their last summer day. Ichika then suggests that they bring the whole group, angering Laura. Ichika then goes around the whole day inviting the other girls to the Amusement park. Meanwhile, Charlotte and Laura decide to go shopping. During their trip, Charlotte and Laura become mini celebrities in a clothing shop, employees at a maid cafe, and heroines when they break up a hostage situation at the maid cafe. The scene then cuts to a mysterious woman named M breaking into a heavily guarded facility to retrieve a confined IS using an extremely powerful IS of her own named Silent Zephyrus. The scene then cuts back to the girls and Ichika at the Amusement park having a fun time. The episode ends with a quick appearance by Sarashiki Tatenashi.