Chouno-senpai wa Oyogasetai!

Due to an injury he sustained in middle school, Furui had to quit swimming, which he loved. When he entered high school, he was strongly persuaded by the beautiful club president, Chono-senpai, to join the swimming club as manager. Surrounded by the beautiful and charming Chono and other cute girls, he enjoys his high school life and grows, even though he is teased.

(Source: Comic Fuz, translated)