S2E03 Butterfly of Farewell!

The Butterfly of Farewell! (別れのバタフライ！ Wakare no Batafurai!) is the third episode of season two of the Free! anime, and the fifteenth episode of the overall series. It aired on July 16, 2014.

Synopsis
Rin Matsuoka changes dorm rooms, moving in with Sosuke Yamazaki, while Momotarou Mikoshiba takes his place as Aiichiro Nitori's roommate. Meanwhile, Iwatobi High School holds a culture festival, where the swim club participates in a relay race against the other clubs, though their victory does little to attract new members.

As the group turn their attention towards the next national tournament, Rei Ryugazaki worries about whether it is okay that he can only swim butterfly. His worries increase when one of his old upperclassmen from the track team asks if he would like to return to the team. Nagisa Hazuki becomes concerned when Rei starts going off on 'errands' after school, with the others soon becoming suspicious as well. Spotting Rei speaking with the track team captain, the others get together to try and convince Rei not to quit the swim team. After Rei reveals that he has no intention of quitting, the group follow him to his 'errand', where they learn that Rei has been secretly taking swimming lessons from Rin to learn other styles besides the butterfly.

Characters
List of characters in order of appearance: