Aki (Kagura) who was entrusted with the tsukuda of his nephew by her older sister and wife's overseas assignment. The ruthless nature of the young niece was fresh for a mannerized couple's life. One day, in Takuya's room, I see a tissue scrap after self-consolation. Aki felt a man in the elbow and could not control the urge to rise, but finally crossed the line that should not be crossed. After that, Aki forgets himself in 3P with friends of Takuya and becomes a pleasure.