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- Official name：七ヶ浜政宗
- English name：Masamune Shichigahama
- Chinese name：七滨政宗
- Other names：しちがはま まさむね
- Gender：Male
『Masamune Shichigahama』
Birthplace: Miyagi
Masamune is a third year student and the captain of Ao High School Men's Rhythmic Gymnastics Club. His passion for rhythmic gymnastics and feelings for the club is second to none.
He is Tsukidate and Onagawa's childhood friend. His house is a long-established Sasa Kamaboko shop.
