Sixteen-year-old Seri Satou loves cute boys, and her classmate Misaki Modori is exactly her type. Hoping to close the gap with him, Seri invites Misaki to the library. But just before they can enter the room, the two see the promiscuous Shin Seo getting intimate with another girl inside. Enraged, Seri scolds the arrogant Shin for his behavior, only for it to backfire on her when Shin decides that he has his sights on subjugating her next. Now, Seri's goal of growing close to Misaki seems to be in jeopardy as she must find a way to stave off Shin's advances.