An otaku college student who started living alone when he entered college. Her sister, who was jealous of such a man, started coming and going in and out of the room frequently. She negotiates to rent her brother's room as a place to have sex with her boyfriend, but her sister refuses because her friends are coming. In her embarrassment, her sister has a sudden idea to implement her nefarious idea. Her habit of sado awakened while mentally driving her own brother. He ridicules the appearance of her brother who destroyed her friendship and made her masochistic.
