Since humans and yokai chose to coexist, Kyoto is overrun with demi-humans, spirits, and demons! Saki, a succubus and student in this magic-infested city, has become the queen of her school thanks to her magic and beauty.

But her arrogant behavior makes her plenty of enemies as well, including Yuu Ashiya, a persistent boy who's the only remaining holdout against her seduction. Saki finds herself competing for his affections—with other demi-humans?! As the self-proclaimed queen, Saki has no choice but to beat them to the punch, no matter what she must do to seduce Ashiya!