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You Weren't My Sister, but My Fiancé!?

You Weren't My Sister, but My Fiancé!?

お前妹じゃなくて許嫁だったのかよ!?

Takashi Shiina fondly remembers the days when his younger sister Kana adored him, but now he laments the growing distance between them, as she often ignores him. His world is turned upside down when his parents reveal a shocking truth: Takashi is not their biological son, and they ask him to become engaged to Kana, the girl he always thought was his sister.

Suddenly, the siblings find their relationship redefined as potential romantic partners. They must navigate a confusing new reality, grappling with fluctuating emotions and a bewildering shift in their dynamic. The comfortable familiarity of their past is gone, replaced by an inevitable and complicated change.

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