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- Official name：大湊秀夫
- English name：Hideo Oominato
- Chinese name：大凑秀夫
- Other names：おおみなと ひでお
- Gender：Male
『Hideo Oominato』
Birthplace: Aomori
Hideo is a second year member of the Shiro High School Men's Rhythmic Gymnastics Club.
His father runs a local manipulative therapy clinic, where all members of Shiro High are taken care of.
Hideo has a very detailed personality.
