One day, when Kotomi returned home, there was an unfamiliar boy. When she asked her mother about the situation, she was told that they would be looking after him at home for one week while a relative couple was on a trip.

His name is Ren. He is a boy younger than Kotomi.Kotomi felt uncomfortable with the cheeky Ren, who called her by her first name in an overly familiar way.

But as things turned out, Ren ended up staying in Kotomi's room. Remembering a scary TV program he watched during dinner, Ren was afraid to sleep alone. Kotomi reluctantly decided to let Ren into her bed.

Kotomi reluctantly decides to let Ren into the bed. Ren, who had gotten into bed, clung to Kotomi. Kotomi had felt a certain innocence about Ren, but gradually, the movement of his hands became lewd. Kotomi tried to reject him, but with practiced hands, her large breasts were fondled, and she was quickly made to feel good.