The adventures of a Demon King who awakens 500 years after his defeat in a futuristic world.

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.

When slovenly Amane falls ill after giving his angelic neighbor Mahiru his umbrella in a rainstorm, she steps up to care for him and his messy apartment.