I had many unfair sex with my trash-like younger sister's husband.

Her younger sister Reiko, who eloped, comes along with her husband. Although she is nervous about Reiko's husband meeting for the first time, Hitomi waits for the two of them, either now or in the present. "Onie-sister!" Reiko jumps crying as she sees Hitomi's face. Just as she thought it would be tears of reunion, Reiko complains that she has discovered an affair. A change from the celebratory mood. The Hitomi couple greet the two in an awkward atmosphere...