It's me as Rin Matsuoka From Free!

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Rin is Haruka's rival and his former teammate in elementary school. He comes back to Japan after studying abroad in Australia during middle school and becomes estranged to his former teammates due to a change in his personality,[1] which came after he suffered a tough loss in a race against Haruka during their first year of middle school. He goes to Samezuka Academy, but did not initially join the swim team at Samezuka. His swimming style is freestyle and butterfly.