S2E03 Butterfly of Farewell!

Butterfly of Farewell! (別れのバタフライ！ Wakare no Batafurai!) is the third episode of Season 2 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 Momotaro Mikoshiba takes his place as Aiichiro Nitori's roommate. Meanwhile, Iwatobi High School holds a culture festival where the Iwatobi Swimming Club wins in a land-based relay race against the other clubs, though their victory does little to attract new members. Rei Ryugazaki worries that he can only swim butterfly, his worries increasing when a member of the track team asks if he would like to return. 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 Tadanori Sera, the track team captain, they gather and beg Rei not to quit the swim team. After Rei reveals that he has no intention of quitting, the group follows him to his 'errand,' where they learn that Rei has been secretly taking swimming lessons from Rin to learn other strokes besides the butterfly.

Characters
List of characters in order of appearance: