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An otaku college student who started living alone when he entered college. Envying such a man, my sister began to enter and exit the room frequently. My sister negotiated to rent her brother's room as a place to have sex with her boyfriend, but she refused because her friend was coming. The troubled sister decides to carry out a diabolical idea that came to her mind... A habit called sad that awakened while driving his brother mentally. He ridicules the appearance of his older brother, whose friendship was destroyed and made him a masochist.