Please forgive me... I was violated by my sister's boyfriend. Rina came to Tokyo relying on her older sister Maya, who lives there married. She's staying at Maya and her husband's place. While the sisters chatter happily about Rina's new boyfriend, her husband is filled with worry, burdened by the responsibility of having a young woman staying with them. Ignoring his concerns, Saeki—a man with a pleasant demeanor—dutifully drops by to greet them after seeing Rina off from a date... But this man, while appearing serious on the surface, is a womanizer at heart. He lusts after Maya without restraint...