主人公の双子の姉で風紀委員をしている。 性格は生真面目で貞操観念が強く、初心なのでエッチなことは不潔だと思っていて、エッチは子作りの方法で結婚した後にする神聖なものだと思っている。 エッチなことが好きな主人公を恥ずかしく思い、監視している。 「葉のばかぁ！ どうしてそうえっちなの！」
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