Rin Matsuoka

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The rival swimmer from Samezuka Academy.

Rin Matsuoka is Haruka's rival who is also in 11th grade. He had gone abroad to study swimming, but his personality changed immensely by the time he had returned to Japan and for this reason he often perplexes his former teammates.

Rin goes to all-boys school.

While he may not look like a loving brother, he cares for Gou, and is very protective of his sister.

In the drama CD, he asked Captain Mikoshiba not to call Gou by her first name, declaring that he'll never give him permission to do so. Despite not being present when Captain Mikoshiba asked Gou out on a date (in which Gou turned him down), he felt like punching Mikoshiba after he has done so, and was wondering why he suddenly felt like that.

He is strongly opposed to the idea of Gou dating any males, getting extremely worried and uncharacteristically worked up when he thought that Gou was on a date with a guy every week (or preparing a present for a guy), and he ended up stalking her on one of her 'date' (although only after promptings from Nitori).