While Aoi Kurugi is home alone, a rapist sneaks into her house. Forgetting the rule she was told — "don't open the door for anyone" — she unlocks the door, only to have her pants suddenly yanked down and be brutally penetrated. Pounding thrust after thrust — splurt! splurt! ugh!! — he cums inside her almost instantly, revealing his extreme premature ejaculation. Then, in an absurd and unjust demand, he orders Aoi to cure his premature ejaculation, kicking off a bizarre day. What follows is a surprising turn of events as she attempts to treat his condition.