Yukina-汚いアパートに閉じ込められた世界的に有名な麻雀プレーヤーパート1

Yukina works for a married delicatessen. One day, a customer suddenly pushes her down in the man's room and pushes himself inside her, and she is placed under house arrest. The man's training escalates and she has sex in front of her inexperienced brother. She is to use incontinence and a vibrator, but gradually awakens to pleasure and develops an affection for the aggressive man.