Female student・hinano. Recently, she got a boyfriend and was once a pure and quiet top student, but she has a habit of fantasizing about having sex with older men every day and indulges in self-pleasure. Although she liked her boyfriend Yuugo, she couldn't direct sexual thoughts towards him... One day, a neighbor named・Kooji came with a bulletin board and raped her while she was asleep, leading to sex. This became the trigger, and her days of debauchery began as Kooji's drinking buddies also got involved.
