S1OVA5 Rei, Theory, and Speedo!

Rei, Theory, and Speedo! (怜と理論とブーメラン！ Rei to Riron to Būmeran!) is the fifth original unaired short movie that came with Free! vol.5, which was released on January 8, 2014.

Synopsis
Rei is worried as he does not have a swimming suit except for the one he had when he was in elementary school. Just as he was worrying, Nagisa came in showing him a bunch of swimming suits and asking him to choose one as he had to take responsibility due to what he said before Rei joined the club. However, Rei cannot make up his mind, thus, Nagisa calls Makoto and Haruka to give advice. In the end, Rei chooses a speedo due to what Makoto had said.

Characters
List of characters in order of appearance:

Trivia

 * Prior to Free!'s English DVD release by Funimation the episode was called 'Rei, Theories, and Speedos!' in English