My father-in-law, Eiichi, who was living a comfortable life abroad, suddenly returned to Japan and stayed at his son and his wife's house for a while. Yuna, a beautiful bride, did not think well of Eiichi, who had always had a violent relationship with women, was pushy and inconsiderate. "If my husband goes to work, I will be alone with my father-in-law." From the next day, Eiichi taught Yuna how to play golf without being asked. Eiichi's unpleasant black hand found its way to Yuna's secret place...