Free! (anime)

Free! Iwatobi Swim Club is a Japanese anime based on swimming. 
Plot.
The main story is about four boys on a swim team. The boys were on a swim team together in elementary and middle school and were split up before high school. Two of the boys, Haruka Nanase and Makoto Tachibana were reunited by fate to both attend Iwatobi High School. Luckily for them, when the new arrival of first years came, the third member from their original swim team Nagisa Hazuki also arrived to Iwatobi High School. Haruka and Makoto were astonished to be reunited with another friend of theirs, however something was missing. The final member to their childhood swim team, Rin Matsouka. Rin had been studying abroad in Australia and recently came back to Japan to go to high school at Samezuka Academy. When Haruka, Makoto, and Nagisa all caught up, they run into the younger sister of their old friend Rin, Gou Matsouka, who fills the boys in about Rin's whereabouts and goals. They are all determined and decide to start their own swim club to have the opportunity to see Rin once more. With Gou as the manager and Makoto as the captain, the Iwatobi Swim Club needed one more thing to complete their team, a fourth member. The boys advertised everywhere however no one wanted to join. Until one day, Nagisa had stumbled across a first year who had a similarity with he and the other two boys on the team, he had a girly name.