BAGR-016 - Otaku older brother's friendship and sexual preferences are distorted by a bitchy-style younger sister, Ichijo Mio

A college otaku male starts living alone due to university entrance. His sister, envious of him, began to frequently enter and leave his room. She negotiates to borrow her brother's room as a place to have sex with her boyfriend, but is refused because friends are coming over. The troubled sister suddenly comes up with a heinous idea and decides to execute it… A sadomasochistic tendency awakened as she mentally pushes her brother to the brink. She mocks the sight of her brother, whose friendship has been destroyed and who has been masochized.