The Testament of Sister New Devil

The BEST episodes of The Testament of Sister New Devil

Every episode ever - ranked by fan votes!

Toujou Basara is a high school student whose father has suddenly just remarried. His father then departs overseas leaving Basara with two new beautiful step-sisters. Little does he know, his new sisters, Mio and Maria are actually the new Demon Lord and a succubus!? Almost trapped into a life of servitude, Basara forms a reverse contract by accident and ends up becoming Mio's master! Hijinks ensue as Basara finds himself in one ecchi situation after another. However, Mio's life is in danger as she is pursued by demons and heroes!

Last Updated: 4/17/2022Network: Tokyo MX
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The Consequences of What Must Be Done
star
8.58
71 votes

#1 - The Consequences of What Must Be Done

Season 2 - Episode 10 - Aired 12/12/2015

The council's rampage sends quakes through the demon realm, and the demon Chaos is called forth through a giant magic circle. That commander of all heroic spirits flails madly, seeking to claim Basara, Mio, and Leohart's lives. Do they even stand a chance of victory with this supreme being before them?! Meanwhile, Maria, Yuki, and the others put a final end to their own personal battle. "Believe in me... once more." The ultimate sibling combo risks their lives to face the disaster striking all of the demon realm!

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Beyond the Endless Dream
star
8.57
69 votes

#2 - Beyond the Endless Dream

Season 2 - Episode 9 - Aired 12/5/2015

The only remaining match of the tournament is the duel between leaders, Basara vs Leohart. Basara finally appears after his long time in hiding, and faces off against Leohart. The two demon swords clash in fierce battle. Though Basara manages to keep up with Leohart, Leohart clearly holds an overwhelming advantage. Basara is unable to use his Banishing Shift due to the large opening it creates. What secret strategy does Basara pull out in the fight...?

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Amidst the Wind Blowing Through the Battlefield
star
8.54
78 votes

#3 - Amidst the Wind Blowing Through the Battlefield

Season 2 - Episode 5 - Aired 11/7/2015

Ramsus is out to extract the "Demon Lord's Power" that Mio possesses, and Basara reveals his anger at Ramsus' lack of concern for Mio's safety. Just as sparks are about to fly, Shella interrupts them. She leads Basara into the bath to try and help calm him down, and when Zest appears, she orders Zest to massage and wash Basara's body with her bountiful bosom. Then Shella tries to get Basara and Zest to forge a master-servant pact...

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Between Reality and One's Own Truth
star
8.51
73 votes

#4 - Between Reality and One's Own Truth

Season 2 - Episode 6 - Aired 11/14/2015

Basara and the others recieve a message from Lars, calling them to Leohart's royal castle. Then Basara's father, Toujou Jin, appears before them all. He brought with him another message from Leohart. A message saying that they would hold a tournament before Leohart and Ramsus' forces to determine authority of the demon realm--authority of the demon realm being synonymous with Mio's power. After being selected as the representatives, Basara begins learning "how to win" from Jin.

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Between Entwining Plots and Desires
star
8.46
68 votes

#5 - Between Entwining Plots and Desires

Season 2 - Episode 7 - Aired 11/21/2015

Basara and the others finally face the current demon lord, Leohart. Leohart's confidence in his strength fills the air as he welcomes them in without any tricks. Can they really beat him? After Maria encourages them to do what they can for now, Basara commands Mio, Yuki, Maria, Kurumi, and Zest to strip for him. Using items full of aphrodisiacs, they lick, molest, and entwine together...

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Those Contending for the Future
star
8.43
69 votes

#6 - Those Contending for the Future

Season 2 - Episode 8 - Aired 11/28/2015

The group battle between Leohart and Ramsus's forces finally begins. After Mio wins the first match, Maria enters the arena for the next round. Her opponent is Lars. Maria uses her enormous power to face him in close combat, but she fails to overcome the gap in experience and magic power, and gets driven into a corner by Lars' clever attackes. What does Maria pull out in hopes of overturning the battle...? Meanwhile, the demons lay a cowardly trap for Kurumi.

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Suspicions Deepening Within Mysteries
star
8.41
81 votes

#7 - Suspicions Deepening Within Mysteries

Season 2 - Episode 2 - Aired 10/17/2015

The day of the sports festival is finally here. Though Basara remains cautious of the mysterious enemy who manipulates people with magic, he happily enjoys the sports festival with Mio and Yuki as the three of them compete in the four-legged-race and enjoy their youth getting entangled and sweaty with each other. Meanwhile, Kurumi, who was placed in charge of guarding the school, discovers a suspicious individual. At almost the same time, a giant twister forms on the sports field. Basara fights to protect the students... but an unexpected individual appears!

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Until Sadness Reaches Zero
star
8.40
152 votes

#8 - Until Sadness Reaches Zero

Season 1 - Episode 4 - Aired 1/29/2015

Basara suffers a deep wound in the battle against the white-masked man after Mio's power. Mio regrets getting Basara involved, and challenges the white-masked man to battle on her own. Meanwhile, in order to protect Mio, Basara resolves to use the "forbbiden art" he sealed away after the events of his past. What was the tragedy that visited the hero village and Basara?

Directors: Hisashi Saito
My Cherished Feelings For You
star
8.40
80 votes

#9 - My Cherished Feelings For You

Season 2 - Episode 3 - Aired 10/24/2015

After taking Kurumi hostage, Ornis robs Basara of the right arm wielding Bynhildr. Though he lost conciousness from the pain, his sealed power unleashes and goes on a rampage. Their positions are reversed as he corners Ornis with his overwhelming power. However, the moment he tries to silence Ornis for good, a golden chain appears and binds him. When Ornis turns around, he finds Hasegawa Chisato. What secrets has she kept hidden?

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Plaintive Betrayal
star
8.39
126 votes

#10 - Plaintive Betrayal

Season 1 - Episode 10 - Aired 3/12/2015

Mio has been captured by Zolgia following Maria's betrayal. Basara too is captured by Lars and brought to Zolgia's mansion. Lars' goal is to exchange Basara for Mio. He explains that he's only doing his duty as Mio's observer, but negotiations fail, and Zest slays him.

Directors: Hisashi Saito
Amidst Entwining Plots
star
8.33
73 votes

#11 - Amidst Entwining Plots

Season 2 - Episode 4 - Aired 10/31/2015

As the clash between the peaceful faction and the present demon lord faction draws near, Basara visits the peaceful faction along with Mio. Though Basara enjoys their reunion with Zest and Shella, Maria seems to be acting odd. In fact, a heavy punishment was awaiting her for her betrayal of the peaceful faction. Basara begs Rukia for her forgiveness, and ends up administering the punishment in her stead... but that punishment was to spank Maria's behind while she was in a state of arousal?!

Directors: Hisashi Saito
Watch Now:AmazoniTunes
The Depths of Love and Hatred
star
8.22
126 votes

#12 - The Depths of Love and Hatred

Season 1 - Episode 7 - Aired 2/19/2015

Basara leads Mio to higher peaks as he pursues pleasure with the use of syrup. With their master-servant pact reaching a new level, they both bring their full might to face the ones trying to eliminate Mio: Takashi and Kurumi.

Directors: Hisashi Saito
Erotic Succubus Out of Control
star
8.07
130 votes

#13 - Erotic Succubus Out of Control

Season 1 - Episode 8 - Aired 2/26/2015

Ten days pass since the battle with Takashi and others. Although the battle ended with reconciliation, Yuki returned to the hero's village. ...or she was supposed to, but when Basara returns home, he finds Yuki in an apron!

Directors: Hisashi Saito
For This Night, This Moment
star
8.05
140 votes

#14 - For This Night, This Moment

Season 1 - Episode 12 - Aired 3/26/2015

As Yuki fends off any enemy approaching the core, Basara, Mio and Zest soon fight against a horde of Zest's clones. The group arrives at the core and Zest offers herself as bait for Basara to kill the beast. In doing so, however, Basara protects Zest and disables the vital core with his Banishing Shift, thus killing the beast. As the girls recover, Basara witnesses Yahiro/Lars executing Zolgear. Back at their home, Zest places her loyalty to Basara. Greatly opposed to the fact of someone else stealing Mio's virginity, Basara and Mio engage in lovemaking until Basara stops mid-way, apologizing for forcing himself unto Mio. As Basara and Mio were about to kiss once more, Yuki interferes and steals Basara's lips and is accompanied by Zest. As Mio and Yuki argue over Basara, the latter runs to Maria and asks her to help him appease the two. Adding to the uproar, Maria lunges at Basara and kisses him. Shella and Zest were then put under the care of the demons from the moderate-faction. Meanwhile, word of Zolgear's death eventually reaches Demon Lord Leohart as he faces Jin Tōjō in his throne.

Directors: Hisashi Saito
Bearing Growing Emotions
star
8.00
133 votes

#15 - Bearing Growing Emotions

Season 1 - Episode 6 - Aired 2/12/2015

Basara goes on a date with Yuki. Unaccostomed to the shopping center, When the two of them are overwhelmed by a clerk's sales talk, Mio stops following to rescue them.

Directors: Hisashi Saito
Watch Now:iTunes
Espionage... What Lies After
star
7.98
129 votes

#16 - Espionage... What Lies After

Season 1 - Episode 11 - Aired 3/19/2015

Strength as a human, the power to rend evil--With the power inherited from his father, Toujou Jin, Basara faces off against Zolgia. Basara is driven by the desire to protect his precious family. That desire gives him strength, and even as Zolgia pushes him to the edge, he rises without breaking. However, even Basara eventually runs out of strength facting that all too powerful might. His mind in despair, he's unable to escape from Zolgia's dominion...

Directors: Hisashi Saito
Watch Now:Amazon
A Little Sisters’ Morning Demon Lording
star
7.92
142 votes

#17 - A Little Sisters’ Morning Demon Lording

Season 1 - Episode 5 - Aired 2/5/2015

With the battle against the white-masked man settled, they returned to their bawdy daily life. Basara wakes up with his hand groping Maria's butt, he runs into a naked Mio when he enters the bathroom, and Yuki sneaks into the bath with him. The master-servant pact lying at the heart of everything. Accoring to Takigawa, his classmate and the white-masked man, the pact between Basara and Mio holds another secret. Meanwhile, Basara's childhood friend Yuki invites him out on a date...

Directors: Hisashi Saito
What I Can Do For You
star
7.92
120 votes

#18 - What I Can Do For You

Season 2 - Episode 1 - Aired 10/10/2015

After ending the battle against Zolgia, Basara regains his peaceful life with his two little sisters, Mio, the daughter of the previous demon lord, and Maria, her little sister who's also a succubus. As Basara pursues the preparations for the sports festival at school, one day he's attacked by a person being manipulated by magic. Recalling the strange gaze he felt at school, a suspicion of his begins to grow...

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Merits and Demerits of Master and Servant
star
7.90
128 votes

#19 - Merits and Demerits of Master and Servant

Season 1 - Episode 9 - Aired 3/5/2015

Basara and Yuki begin the ceremony to form their pact. Clad in a bustier and garter belt, Yuki was raring to go for it, but she refused to forge the pact normally, and suffered the same succubus curse as Mio.

Directors: Hisashi Saito
First Contract Between Servant and Master
star
7.88
164 votes

#20 - First Contract Between Servant and Master

Season 1 - Episode 2 - Aired 1/15/2015

As daughter of the former demon lord, Mio's foster parents were slain by powerful demons after her life. Still seeking to slay her, Basara reveals himself as a member of the hero clan--an enemy of the demons--and vows to protect Mio as a member of his family.

Directors: Hisashi Saito
Watch Now:AmazoniTunes
Reunion and a Gap in Trust
star
7.88
160 votes

#21 - Reunion and a Gap in Trust

Season 1 - Episode 3 - Aired 1/22/2015

Basara's childhood friend Nonaka Yuuki warns him not to get involved with Naruse Mio any longer. She is a fellow member of the hero clan, and the one charged with observing Mio. She claims that Mio will bring great disaster, but Basara proclaims that he will protect Mio as a girl on his own.

Directors: Hisashi Saito
The Day I Got a Little Sister
star
7.31
207 votes

#22 - The Day I Got a Little Sister

Season 1 - Episode 1 - Aired 1/8/2015

Thanks to his father's sudden remarriage, Toujou Basara finds himself with two beautiful new step-sisters. Their names are Naruse Mio and Maria. Mio wakes him up in the morning, while Maria stands in the kitchen wearing a suggestive outfit...

Directors: Hisashi Saito