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Chisa Kotegawa (古手川 千紗)Gender: Female
Age: 18 (Manga), 20 (Anime)
Hair Color: Brown
Affiliation: Grand Blue, Peek a Boo, Izu University
Occupation: University Student
A first year student at Izu University. She is the younger sister of Nanaka Kotegawa and cousin of Iori Kitahara.
Though generally appearing indifferent, she is very caring and concerning to others close to her. She hates getting hit on by other guys so much she went as far as declaring Iori as her "fake" boyfriend to ward off guys. She loves diving so much that she wants to befriend anyone who's interested in diving and has ocean sounds as her music playlist.