Mr. and Mrs. Kasumi who live together with their brother-in-law in a two-family house left by their parents. However, the relationship between his brother-in-law and his wife is delicate, and his wife Keiko just ran out of the house this morning. Kaho, a sister-in-law who takes care of her brother-in-law, Shinji, without seeing it. Shinji, who was strongly attracted to her kindness, hugged her unintentionally. Kaho desperately tries to convince her, but she loses to the desperation of her brother-in-law who is recklessly demanding her, and ends up forgiving her body. Since then, Kaho’s body, remembering the joy of being fucked, can’t stop the sweet pain that echoes in her uterus.