Basara Toujo es un estudiante de instituto al que un buen día su padre le hace una extraña pregunta: “¿No decías antes que querías una hermana pequeña?”. Acto seguido, anuncia que se ha vuelto a casar y que ahora Basara tiene dos hermanastras bellísimas. Después de tamaña revelación, su padre se embarca en un largo viaje. Sin embargo, las gemelas Mio y Maria Naruse no son lo que parecen, ya que en realidad son ni más ni menos que un demonio y un súcubo. Sin comerlo ni beberlo, Basara acaba formando un peligroso contrato en el que se convierte en el siervo de ambas pero, debido a un error, acaba siendo él su maestro. Por si esto no fuera poco, la vida del muchacho empieza a llenarse de situaciones con erótico resultado. Además, “la pobre” Mio es el blanco de otros monstruos y héroes, por lo que su nuevo hermano la debe proteger.
Shinmai Maou no Testament (Temporada 1)
The Day I Got A Little Sister (Episodio 1) 7.6
Fecha de emisión: 2015-01-07
Duración: 25 min
Sinopsis: 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...
First Contract Between Servant And Master (Episodio 2) 7.5
Fecha de emisión: 2015-01-14
Duración: 26 min
Sinopsis: 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.
Reunion and a Gap in Trust (Episodio 3) 6.3
Fecha de emisión: 2015-01-21
Duración: 25 min
Sinopsis: 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.
Until Sadness Reaches Zero (Episodio 4) 6.0
Fecha de emisión: 2015-01-28
Duración: 25 min
Sinopsis: 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?
A Little Sister's Morning Demon Lording (Episodio 5) 5.2
Fecha de emisión: 2015-02-04
Duración: 25 min
Sinopsis: 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...
Bearing Growing Emotions (Episodio 6) 5.3
Fecha de emisión: 2015-02-11
Duración: 25 min
Sinopsis: Basara goes on a date with Yuki. Unaccustomed to the shopping center, when the two of them are overwhelmed by a clerk's sales talk, Mio stops following to rescue them.
The Depths of Love and Hatred (Episodio 7) 5.5
Fecha de emisión: 2015-02-18
Duración: 23 min
Sinopsis: 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.
Erotic Succubus Out of Control (Episodio 8) 7.8
Fecha de emisión: 2015-02-25
Duración: 24 min
Sinopsis: 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!
Merits and Demerits of Master and Servant (Episodio 9) 8.3
Fecha de emisión: 2015-03-04
Duración: 24 min
Sinopsis: 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.
Plaintive Betrayal (Episodio 10) 8.0
Fecha de emisión: 2015-03-11
Duración: 24 min
Sinopsis: 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.
Epsionage... What Lies After (Episodio 11) 5.2
Fecha de emisión: 2015-03-18
Duración: 23 min
Sinopsis: Strength as a human, the power to rend evil--With the power inherited from his father, Tojou 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...
For This Night, This Moment (Episodio 12) 7.3
Fecha de emisión: 2015-03-25
Duración: 25 min
Sinopsis: Everyone is trapped inside the body of the demon realm's most dangerous creature, a beast capable of infinitely multiplying until it swallows the entire world. Dimensionally cut off, the only remaining option for Basara and the others is to completely eliminate this dangerous creature's vital core.
