Rina has come to Tokyo to rely on her older sister Maya, who is married and living in Tokyo, and is now living with her sister and her husband. While the sisters happily talk about their new boyfriends, her husband is worried about his responsibility for taking care of their teenage daughter. Despite her worries, Saeki, a friendly man, comes to greet Rina as she returns from a date... However, this man appears serious on the surface, but is actually a womanizer. He is unprincipled and lusts after Maya...