When hanging out in a gay bar, Koushi Yanagi a university student, meets a very sexy office worker, whom after getting drunk accepts his advances. But when the office worker becomes sober, suddenly he loses his nerve, starts acting violently and runs away. Koushi disgusted and angry accepts an invitation from Takashi Kirishima, aka Ten, his sex friend.
At Ten's house Koushi meets the office worker again. He is Ten's twin brother, Arata Kirishima, a researcher in a laboratory. Later Koushi visits Arata's room when Arata is home alone. Arata denies the incident and tries to give money to Koushi asking him to leave, but Koushi offended, goes wild with anger and rapes Arata. Arata asks Koushi to keep what happened from his brother but it makes Koushi angry all the more. Blackmailing Arata with the promise of telling Ten everything, Koushi makes Arata his sexual slave, but gradually they become attracted to each other
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