- Haruka Saigusa : Haruka is Kanata's twin sister. Initially, they hated each other, especially Kanata. She always thought of Haruka as a trouble maker because of her always breaking the rules. After solving their family problems, they start to openly care about each other.
- Shou Saigusa : Shou is one of Haruka's fathers and the biological one assigned to her (which father is whose biologically is never actually revealed).
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