Free! Episode 4: Captive Butterfly!

info: MAL/wiki/AniDB

The Swim Club officially starts training in the refurbished pool using an old training regiment Kou had unearthed. Rei's inherent academic skills at learning all the swimming theory prove to be useless since his body refuses to move in the water...

So in this week's episode nothing happened actually, Rei was learning how to swim and we got some more definitely not gay moments. Watch it here.