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Nao and I are not real siblings. - Nao was the stepchild of her father's remarriage when she was a student. - After that, Nao, who was a year away from her parents' death in an accident, took the place of my parents. - Life with them was lonely, but I was happy because I was in love with Nao. - One day, her best friend Yuzuru was talking to Nao sister, and when she approached while remembering her jealousy, she was well distracted. - And at some point, Nao's sister is often late for her return ...