Hotaru Hinase, a first-year high school student, witnesses Saki Hananoi breaking up with his girlfriend. Hotaru finally agrees to date him after he always helps her, even though she doesn't really understand love and romance.

Despite wanting a quiet reborn life, this former college girl levels up to the max as the villainess.

Follows Oliver Horn as he enters a prestigious magic school named Kimberly. He discovers that not everything is as it seems, with the emergence of labyrinths, monsters, and other threats that endanger the students.