Akutsu Masatora adalah iblis yang telah menyusup ke sebuah SMA di dunia manusia. Tujuannya adalah menemukan kandidat untuk membantu Neraka dalam perang melawan musuh alami mereka, para malaikat Surga. Ditugaskan duduk di sebelah Lily Amane, siswa lain yang dipindahkan ke sini belum lama ini, Akutsu menjadi mangsa kecantikannya dan memutuskan untuk merekrutnya untuk tujuan itu.

Lily and Akutsu both have everything to prove as they embark upon their new, fraught relationship dynamic. Who will come out on top in the battle for dominance?!

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.

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.

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