Rin Matsuoka is the freestyle and butterfly swimmer on Samezuka Academy's swim team and a 3rd year high school student at Samezuka Academy. Rin is a muscular young man with semi-long, maroon colored hair. He has red eyes and shark-like teeth. The teenager aspires to make his father's dream of becoming an Olympic swimmer come true and has detached himself from everyone while working toward that particular goal. At times, Rin displays a softer side, as he is shown to still harbor concern for his friends' well-being and acts like a mentor toward his younger sister Gou and teammate Nitori. Rin is conflicted emotionally, but his pride as a swimmer is used to mask his insecurities. After Seijuro Mikoshiba graduated from Samezuka Academy, Rin became the new captain of the swimming team.
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