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. At the same time, Rin faces Haruka, and a challenge was presented, which resulted in Rin winning. Taking this as an opportunity, hoping to have a chance to see Rin again during the competition, Haruka accepted Hazuki Nagisa's proposal to create a swimming club, and decided to regroup with Tachibana Makoto and Hazuki Nagisa who are currently in the same school, and add new member Ryuzaki Rei, reviving the aquatics club of Iwatobi High School that was previously abandoned. A boy high school student full of energy unfolds this story about swimming, youth, and bonds...