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- Official name：坂井理奈
- English name：Rina Sakai
- Chinese name：坂井理奈
- Other names：さかい りな
- Gender：女性
- Birthdate：May 30
- Height：156cm
- Weight：48kg
- Bloodtype：AB
- Zodiac：天蠍座
『Rina Sakai』
The student council vice president and Mitsuki's classmate. She is in love with Mitsuki, despite knowing of Mitsuki's crush on Haruka.
