Umi Mamizuka

Serving as the dedicated physical education instructor at Morinomiya Academy, this devoted mother plays a central role in her family's lives. Alongside her husband, Kousuke Mamizuka, she focuses her energy on raising her twin sons, Kazuma and Takuma. Her life balances the disciplined demands of her teaching career with the warmth of managing a busy household, making her a cornerstone of the Mamizuka family dynamic.