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Marino Houjou 宝城茉莉乃
Yu's childhood friend. but when she was 5, an accident make her memory gone and her parents passed away. from there, she live with her aunt. but one day, her aunt told to her that she must marry a stranger. Cause of she didn't want to, Marino ran away and met Yu again in A school dormitory. for a few month she live there but her feelings with Yu developed too.