Yuuji comes to her parents' house to greet her. - Her mother-in-law, Yumi, happily accepted her, and the two were happily married. - Her father-in-law had already passed away, and Yuji and his wife decided to live with Yumi at her parents' house, thinking that it would be lonely without their daughter. - Six months later, Yumi spends her days masturbating in agony every time she hears the sounds of Yuji and his wife's nightly activities. - Reaching the limit of her patience, Yumi finally sneaks into Yuji's bedroom while her daughter is sleeping over...