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Synopsis

Omiya Rena, who serves as student council president, lives alone in the family home with her younger brother Shota while their parents are away for a year. Shota has harbored an intense fixation on Rena since childhood that progresses from immature teasing into persistent, unwanted sexual behavior. Although Rena recognizes the moral and emotional wrongness of their situation, she finds herself unable to stop Shota’s advances. The dynamic intensifies until Rena yields and accepts a subservient sexual role to him. The household’s fragile secrecy is jeopardized when their younger sister Aina returns home unexpectedly, raising the possibility that their illicit relationship will be discovered.