#1 - Reaper Time, Part 1
Season 2 - Episode 7
A well-intentioned act leads to a falling-out with Professor Bitch. Soon the E Class finds itself facing off alone against a formidable assassin foe.
#2 - Think Outside the Box Time
Season 2 - Episode 12
The end-of-term exams come down to one doozy of a final problem. Principal Asano comes to Koro Sensei with a little wager that has a lot riding on it.
#3 - Time for the Summer Festival
Season 2 - Episode 1
Koro Sensei and his students try some matchmaking at the end of their island trip. Class 3-E's eventful summer ends with a taste of pure festival fun.
#4 - School Trip Time - First Period
Season 1 - Episode 7
The students go on a school trip to Kyoto, where they must still keep assassination foremost in their minds. Kanzaki faces trouble from her past.
#5 - Ball Game Tournament Time
Season 1 - Episode 12
A baseball tournament is to be held, in which Class 3-E are forced to play an exhibition match against the top players of the school's baseball club, which Sugino used to be a part of. Despite knowing the odds are against them, particularly when pitted against the club captain Shindo, Sugino remains determined to win, prompting Koro-sensei to coach them for the match, teaching them how to go up against his mach speed fastballs. On the day of the match, Class 3-E use a bunting strategy to load the bases, allowing them to get an early lead. Not willing to let this slide, Asano takes over as the baseball club's coach to put a stop to Class 3-E's bunting strategy, using the power of hypnotic suggestion to turn Shindo into a bloodthirsty warrior. With the bases loaded against them, Class 3-E manage to use some provocations Karma made concerning some unfair play earlier to their own advantage, placing some of their player up close to Shindo to prevent him from swinging without hurting them, allowing Class-E to win the match. Afterwards. Sugino expresses how he wanted to show off the friends he made in Class 3-E, managing to rekindle his old friendship with Shindo.
#6 - Spinning Time
Season 2 - Episode 4
Itona endears himself to the boys in Class 3-E as he shows off his assassination creation. The students call each other code names for an entire day.
#7 - School Trip Time - Second Period
Season 1 - Episode 8
The E Class gives a pro sniper plenty of chances to take down Koro Sensei, then try to make the most of what's left of their school trip to Kyoto.
#8 - Before & After Time
Season 2 - Episode 6
After an accident, the E Class winds up doing a whole different kind of studying off campus. But will they have a chance to bone up for the midterms?
#9 - Confession Time
Season 2 - Episode 15
Koro Sensei begins to come clean about his background after a tense and terrifying encounter with a student who has her own reasons to kill him,
#10 - Karma Time
Season 1 - Episode 3
The brilliant, belligerent Karma Akabane, Nagisa's former classmate, joins 3-E and immediately jumps into the assassination mission with both feet.
#11 - Secret Identity Time
Season 2 - Episode 14
Following the drama festival, the E Class learn that one of their classmates is hiding a big secret connected to Koro Sensei's past!
#12 - Past Time 7.95
Season 2 - Episode 16
Following the traumatic story of Koro Sensei's past, the E Class is left reeling after learning revelations about his past deeds and identity. As the gather themselves with this new information, it begins to affect their assassination plans.
#13 - Assembly Time
Season 1 - Episode 5
Before the torturous school assembly begins, Okuda attempts to poison Koro Sensei in an unexpected way... with unexpected results.
#14 - Transfer Student Time - Second Period
Season 1 - Episode 11
Class 3-E prepare for the arrival of their second transfer student, who is allegedly more powerful than Ritsu. At that moment, a white-robed man named Shiro arrives with the new student, Itona Horibe, who claims to be Koro-sensei's younger brother. When Itona faces against Koro-sensei later that day, it is revealed that he possesses the same kinda of tentacles Koro-sensei has in his hair. While Shiro uses his knowledge of Koro-sensei's weaknesses to give Itona the advantage, Koro-sensei takes advantage of that Itona's tentacles are identical to his and uses Anti-Sensei knives against them, allowing him to knock Itona out of the ring and win the match. When Itona reacts negatively to the thought of studying and tries to counterattack, Shiro knocks him out and takes him back with him. Afterwards, the class try to ask Koro-sensei about how he and Itona are connected, but he remains tight-lipped, stating they must use assassination to find the answers they seek. The students, determined to kill Koro-sensei before anyone else, decide to have Karasuma teach them more assassination techniques.
#15 - Talent Time
Season 1 - Episode 13
As Karasuma briefly senses what appears to be a fearsome aura coming from Nagisa, Akira Takaoka, an aquaintance of Karasuma from the Ministry of Defense, is sent to Class 3-E to take over Karasuma's role as P.E. teacher. While initially proving popular with the students to do his light-hearted personality, they soon learn his true nature as a ruthless and sadistic instructor who uses fear and violence to train his pupils. When Karasuma voices his objection, Takaoka challenges him to pick one of his students to face off against him using a real knife. Placing his faith in the aura he felt before, Karasuma nominates Nagisa to fight against Takaoka. Following Karasuma's advice and going against Takaoka's expectations of being afraid of wielding a knife, Nagisa uses the assassination skills he had learned and manages to get the upper hand on Takaoka, winning the match. When Takaoka violently objects to defeat, Karasuma beats him back while Asano fires him, with Karasuma returning to his usual teaching position.
#16 - Karma Time - Second Period
Season 1 - Episode 20
Karma must use his head to get past a formidable foe. Nagisa goes undercover as the E Class continues to sneak its way to the hotel's top floor.
#17 - Island Time
Season 1 - Episode 17
The E Class trains intently under a pro killer to prepare for their island assassination. Once there, they must make sure everything falls into place.
#18 - Future Time
Season 2 - Episode 25
Graduation day: one of life's chapters ends and another begins as the students and teachers of Class 3-E go on to forge their own paths in the world.
#19 - Outer Space Time
Season 2 - Episode 19
Class 3-E has agreed to try and save Koro Sensei. In order to do this, they must track down confidential information -- information that takes the class to another height.
#20 - Valentine's Day Time
Season 2 - Episode 20
Nagisa remains uncertain about his future as high-school entrance exams loom over him. It's time for Class 3-E to celebrate Valentine's Day!
#21 - School's Out - First Term
Season 1 - Episode 16
After two days of exams, the results are in. Both the ace A Class and the end E Class must come to terms with the outcome--and so must Koro Sensei.
#22 - Trust Time
Season 2 - Episode 21
It's time for the last project from Koro Sensei before the E-Class closes out the year, but the government's own plans and threatens to get in the way.
#23 - Outcome Time
Season 2 - Episode 18
The battle amongst the E-Class comes down to the final two on each side: Karma vs. Nagisa. But, a new obstacle throws a wrench into the E Class's plans.
#24 - L and R Time
Season 1 - Episode 10
Irina is greeted by her former master, retired assassin Lovro, who thinks she should give up as she has no chance of killing Koro-sensei. Hoping to prove him wrong, Koro-sensei proposes a match between Irina and Lovro to see who will be the first to 'kill' Karasuma, offering Karasuma his own incentive should neither win. Despite Lovro's doubts after he fails to kill Karasuma himself, Irina manages to use what she's learned targeting Koro-sensei to get close, with Karasuma accepting defeat at her hands and Lovro acknowledging her efforts. Later, Nagisa, Karma, and Ritsu accompany Koro-sensei on a mach speed trip to Hawaii to watch the premiere of a new movie, getting a lecture along the way and learning a lot more about Koro-sensei's point of view. On their way back, a man in a while cloak observes alongside a boy, the second transfer student who claims to be Koro-sensei's brother.