再婚した夫の連れ子と、微妙な距離感が埋まらない義母「ゆう」。ある日突然押し掛けてきた悪そうな男から、息子が自転車で老婆をひき逃げしたと告げられる。大金を要求され、足りない分は身体で精算しろと、その日から毎日のように*されるようになってしまう…。その様子を見てしまった息子のとった行動とは？

Yu remarried and is unable to fix the distance between her and her step-daughter. One day, an evil-looking man suddenly comes to her and tells her that her son hit and ran an old woman with his bicycle. He demands a large sum of money and asks her to settle the shortfall with her body. From that day on, she is constantly ravaged... What does the son do when he sees this?