Kanna Sano Ki is a high school girl happily in a loving relationship with her boyfriend, but one day while commuting, she suddenly becomes the victim of molestation. In the school bathroom, she realizes her pussy is wet, her arousal intensifying—soon she's forcibly ejaculated on, cum splattering her ass. Her boyfriend grows concerned by her sudden change, but the next day she's molested again. Penetrated on the train, after getting off she grabs his sleeve and desperately demands more sex. Despite not even knowing his name, she remains trapped in this wild, uncontrollable affair.