Natsuki is Kōichi's younger female cousin. After her parents died, she was adopted into his family as his sister. After her brother transfers schools, she does as well so she can still go to the same school as him. (Source: Wikipedia)
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Natsuki is Kōichi's younger female cousin. After her parents died, she was adopted into his family as his sister. After her brother transfers schools, she does as well so she can still go to the same school as him. (Source: Wikipedia)
