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- Official name：亘理光太郎
- English name：Koutarou Watari
- Chinese name：亘理光太郎
- Other names：わたり こうたろう
- Gender：Male
『Koutarou Watari』
Birthplace: Miyagi
Koutarou is a second year student and member of the Ao High School Boys Rhythmic Gymnastics Club. His sharp eyes and pierced ears often scare strangers, but he has a nice personality and takes good care of his juniors.
His house is a ramen shop.
