A college student otaku guy starts living alone after moving for school. His sister, envious of his situation, starts frequently entering his room. She tries to negotiate with him, asking to use his room as a place to have sex with her boyfriend, but he refuses, saying his friends will be coming over. The frustrated sister comes up with a wicked and ruthless idea and decides to put it into action... As she mentally torments her brother, she develops a sadistic sexual preference. She mocks her brother's masochistic transformation, his friendship destroyed.
