Attending the same school and working part-time together, Yui Misaki and Ayano find their relationship taking a dramatic turn when one day, Yui sees Ayano's huge cock in the restroom. Overcome by uncontrollable desire, Yui attacks her. Ayano, who secretly enjoys perverted fantasies, begins to feel pleasure as she is dominated by Yui, and the two eventually start dating. Their deviant sexual acts escalate rapidly, progressing to extreme levels such as fist fucking. The pair continue in an endless cycle of repeatedly making each other cum, leading to an intense and shocking series of events.