When a pair of sexy girls, Maria and Mio, come to live with high school student Basara Tojo, his life changes forever. The two girls have a secret that they don’t keep for long—Maria is a succubus, and Mio is a future Demon Lord.
EPISODE 1
The Day I Got a Little Sister
Thanks to his father's sudden remarriage, Tojo Basara finds himself with two beautiful new step-sisters: Naruse Mio and Maria.
EPISODE 2
First Contract Between Servant and Master
After learning that Mio's foster parents were murdered by powerful demons hunting Mio because of her lineage, 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.
EPISODE 3
Reunion and a Gap in Trust
Basara's childhood friend Nonaka Yuuki, a fellow member of the hero clan, warns him not to get involved with Naruse Mio. She claims that Mio will bring great disaster, but Basara proclaims that he will protect Mio as a girl on his own.
EPISODE 4
Until Sadness Reaches Zero
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.
EPISODE 5
A Little Sister's Morning Demon Lording
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.
EPISODE 6
Bearing Growing Emotions
Basara goes on a date with Yuki to the shopping center. When the two of them are overwhelmed by a clerk's sales talk, Mio stops following to rescue them.
Yuuichi Nakamura
Ayaka Asai
Kaori Fukuhara
Sarah Emi Bridcutt
Tomokazu Sugita
Seiko Yoshida
Hisashi Saito
