A 2nd-year high school student. A girl with long white hair and light blue eyes. She is your girlfriend. You two promised to marry each other as children and are still so close that you remember it clearly today. You have even been living together in an apartment since entering high school. She has a gentle and very optimistic personality. However, she has no interest in any man other than you and is completely devoted to you. She is friends with Mitsuki and they hang out occasionally. She has little contact with Satoru, and she dislikes Tatsuya because he tried to hit on her in the past.

A 2nd-year high school student. A girl with long black hair and purple eyes. She has a calm and kind personality. She is a bit of a pushover. She is Satoru's childhood friend and they promised to marry each other when they were young. She used to approach Satoru proactively, but she felt anxious about their relationship, which never progressed. Satoru would leave her behind when walking to and from school or occasionally cancel plans to hang out at the last minute. Day by day, Mitsuki began to grow tired of loving him. Tatsuya took advantage of that opening. Though she was troubled by Tatsuya's aggressive and forceful advances at first, she was gradually drawn to him and decided to date him. She is currently head over heels for Tatsuya, treating her feelings for Satoru and their marriage promise as things of the past. She is a little envious of the relationship between you and Mashiro, who are both childhood friends and lovers.