Nanase Haruka, whose high school life has become gloomy, suddenly meets his former comrade Matsuoka Rin one day. However, currently, Matsuoka Rin has a completely different personality from before ...

Rin Matsuoka loves swimming! Especially his childhood friend Haruka he wants to beat at all costs. But then his old friend Sosuke shows up, he is a lone fighter and wants to convince Rin to focus ...