In a world where Heaven and Hell are locked in war, the demons are losing ground. To turn the tide, the demon Masatora Akutsu is sent to Earth undercover as a high school student. His mission? Recruit charismatic humans to join Hell’s ranks and restore morale.
But things go sideways when he meets Lily Amane, a beautiful and seemingly innocent girl. Masatora falls for her instantly and tries to recruit her—only to discover she’s actually an undercover angel tasked with hunting demons. She defeats him, spares his life, and places a magical collar on him that forces him to obey her every command.
As Masatora plots to break free and Lily schemes to use him to reform Heaven, their relationship grows increasingly complicated. Beneath the manipulation and rivalry, genuine feelings begin to emerge—much to Lily’s embarrassment and Masatora’s confusion.