Rin Matsuoka

Rin Matsuoka returned from Australia with a more intense personality, driven by the goal of fulfilling his late father's Olympic ambitions. While he serves as Haruka Nanase’s aggressive swimming rival at Samezuka Academy, he secretly hopes to reunite with his former teammates. He maintains a tough exterior, but he is an incredibly protective older brother to Gou, often displaying overprotective-and occasionally stalking-tendencies to shield her from romantic interests.