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Imouto wa Koumonki!?
妹はこーもん期！？
Kazuo lives with his younger sister, who constantly insults him. One day, after a particularly harsh insult, he locks her out of the bathroom as punishment, causing her to wet herself. Instead of letting the incident pass, Kazuo seizes the opportunity to gain control over her.
He offers her a deal: he will keep her humiliation a secret if she agrees to become his slave. Trapped by her own shame and his threat, she has no choice but to accept. What follows is a twisted dynamic of power and submission between brother and sister.
