A college student otaku male started living alone for the sake of advancing his studies. His sister, envious of him, began frequently entering and exiting his room. She negotiated with her brother to borrow his room to have sex with her boyfriend but was refused 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, a sadistic tendency awoke within her. She mocks her brother whose friendships have been destroyed and who has been turned into a masochist.
