BAGR-034 - Otaku older brother's friendship and sexual preferences are distorted by a bitchy-style younger sister, Asugi Mai

A college otaku male starts living alone due to university entrance. His younger sister, envious of him, begins to frequently enter his room. She negotiates to borrow the room as a place to have sex with her boyfriend, but is refused because friends are coming. The troubled sister suddenly comes up with a heinous idea and decides to execute it… A sexual preference called sadism awakened as she mentally pushes her own brother. She mocks the appearance of her brother whose friendship has been destroyed and who has been masochized.