Rena, a female college student, starts a new life with her mother and stepfather after her mother remarries. Rena had come to trust her very kind stepfather, but one day that changed. She witnessed her stepfather sneaking into her room and devouring her underwear. However, she doesn't want to create a sad scene for her mother. From that day on, Rena keeps her distance from her stepfather, but her grandmother's health deteriorates and her mother has to return home for a while. And then, her sly and perverted stepfather interferes with Rena's attempt to escape to a friend's house...
