A college student otaku male started living alone for his studies. His sister, envious of him, began frequently entering his room. She negotiated to borrow his room to have sex with her boyfriend but was rejected because he said friends were coming over. The troubled sister suddenly came up with an extremely evil idea and decided to execute it… As she mentally cornered her own brother, she discovered a sadistic fetish within herself. She mocks the brother whose friendship has been destroyed and who has been turned into a masochist.
