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Shoichi returns to his parents' home after his business stumbles, but is appalled by his family. Only his sister-in-law, Kaho, treats Shoichi kindly. In the midst of a sweltering summer, Shoichi, who is depressed, begins to develop feelings for Kaho, and finally forcibly commits Kaho. What action did Kaho take when Shoichi decided to re-employ him? Two people drowning in sweaty sexual intercourse with body fluids.