Akutsu Masatora transfers to a new school, where he falls for the beautiful and kind Amane Lily on sight. But Akutsu has a dark secret, and a mission... and Lily might be more than meets the eye, as well!

Akutsu is forced into submission by Lily and becomes her servant, and is forced to cooperate in the demon hunt. Akutsu refuses to cooperate, saying that it would be better to be purified than to kill his own people. There, Lily activates the "power of the collar that takes away freedom and inflicts punishment" on Akutsu. Then, Akutsu's body starts moving on its own...

The first demon-hunting expedition by Lily and Akutsu turns up nothing... except for Yuka, a childhood friend of Hirota's who sees Lily as a rival for his affections!

When Lily tracks down a spats-obsessed demon, Akutsu does everything within his power to distract her from the battle. Later, Akutsu's boss visits and demands he work on his game to better recruit a new leader for Hell.

Lily uses her adorableness to the fullest as she tries to manipulate Akutsu into falling for her. She finds her efforts matched by Akutsu, and it quickly turns into a flirtatious battle for the ages.

Lily must navigate a terrifying nightmare to wake up and return to class. When Akutsu requests to have the collar removed to more easily enjoy simple pleasures, unexpected consequences throw both him and Lily into combat.

Akutsu stands by Lily and spends the night at her place. Lily gets incredibly flustered at the idea of rewarding Akutsu for his efforts but refuses to go back on a promise she made in the past.

Lily and Akutsu must deal with the social fallout surrounding Akutsu being spotted leaving Lily's apartment. They execute intricate plans to convince everyone that they don't have feelings for each other.

With Lily sick and bedridden, her avatar comes to school claiming to be her older sister "Lilia." She quickly convinces faculty to let her stay for the day and is a hit among the students.

Lily's brother, Zwei, comes to visit. When he first runs into Lily and Akutsu, he's pleasant and cordial. However, his tone quickly shifts when he thinks he's alone with Lily.

Overwhelmed with rage and disgust at the mistreatment of Lily, Akutsu manifests black wings and attacks Zwei. However, it quickly becomes apparent that even Lily isn't safe from Akutsu in his blind rage.

Akutsu talks with Lilya in his apartment. Lilya talks about Lily's upbringing and the position she has worked so hard to build, and confronts Akutsu for destroying it... Meanwhile, Lily wakes up in Akutsu's bed, mistakenly thinking that someone has assaulted her in her sleep, and attacks Akutsu.