A college student otaku male started living alone due to advancing in his studies. His sister, envious of her brother's independence, began frequently entering his room. One day, she negotiated with her brother to use his room for sex with her casual partner but was rejected because he said friends were coming over. The troubled sister suddenly came up with an extremely wicked 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.
