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An otaku male college student who started living on his own after going to college. My sister, who was jealous of such a man, began to frequently go in and out of her brother's room. My sister negotiates with her boyfriend to rent a room for her to have sex with, but he refuses because she has a friend coming over. The troubled sister decides to carry out a diabolical idea that suddenly comes to her mind... A habit called Sado that he discovered while pushing his brother mentally. He laughs at his older brother, who has had their friendship destroyed and turned into a masochist.