Eimi-san, my brother-in-law, who is cold to me and is beautiful but a bit weak. One day while watching an AV, she suddenly came into the room sweating. And for some reason, I decided to watch AV together without going out. Take responsibility for not being able to sleep in the room. Crossing the fence with her sister-in-law to Japan, a secret life has begun. Is a stubborn attitude when staying with family a barrier for your husband? Living in an adulterous family without a brother-in-law