I Had Inexcusable Sex Many Times With My Younger Sister's Piece-of-Trash Husband. Hijiri Maihara.

My younger sister Reiko, who eloped, comes with her husband. Hitomi, feeling nervous about meeting Reiko's husband for the first time, waits eagerly for them. 'Big sis!' Reiko bursts into tears and hugs Hitomi the moment she sees her. Thinking these are tears of reunion, but Reiko reveals that an affair has been discovered. The celebratory mood shifts. Hitomi and her husband welcome the pair in an awkward atmosphere...