Hakuya Mitsumine

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Hakuya Mitsumine (三峰 白夜, Mitsumine Hakuya?) she is Kobeni Yonomori's fiancé who suddenly appears on her 16th birthday with Mashiro Mitsumine, his younger sister. Her and his sister start living in the same house as Kobeni and Benio Yonomori (Kobeni's older sister).