Michiru, a daughter-in-law who devotedly cares for her father-in-law Ryozo while feeling lonely after her husband is missing.Not only that, she was trampled on by the yakuza-like Sagawa because of her husband's debts, and in contrast to her wounded heart, her woman's prime body reacted, and her voice leaked out. She desperately suppressed her death so that her father-in-law wouldn't ask.She even had her attractive body eroded by her father-in-law's friend, Sugiura.Knowing this, Ryozo curses Michiru for allowing a stranger to take her body, and begins to discipline her obscenely.