Ao Horie wants to ace her exams and land a spot at an elite university, mostly to get away from her father, a bestselling erotic novelist who named her after the line "A for apple, O for orgy". Her plan to avoid all distractions collapses when classmate Takumi Kijima confesses his feelings. Ao tries to brush him off, but her mind keeps spiraling into the impure territory her father's influence planted, and Kijima refuses to give up.