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Mizuki is not a real sibling. - When I was a student, my parents remarried and we met each other. - Several years have passed since then, and after her parents died in an accident, they lived together while supporting each other. - As we continued to live alone, I began to fall in love with Mizuki. - The dream she envisioned with Mizuki as it is is stolen by her best friend Kyohei. - Kyohei, who likes Mizuki, is jealous of her relationship with us, and suddenly approaches Mizuki when I'm not around.