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Imouto Rule
妹三原則
Momono and her husband have moved in with her brother-in-law, an illustrator of adult art. The arrangement seems normal at first, but one day, Momono is caught masturbating while looking at one of his drawings. The discovery shatters the household's fragile peace.
To keep the incident a secret, her brother-in-law forces her to agree to a specific condition: she must live as his younger sister. This means adopting a submissive role, wearing clothes he chooses, and following his rules. As she endures the humiliation of this role, her body begins to respond in unexpected ways, blurring the line between shame and desire. The boundaries of family and forbidden attraction become dangerously intertwined.
