S1OVA5 Rei, Theory, and Speedo!

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

Synopsis
Rei Ryugazaki is worried because he lacks a proper swimsuit, except for the one he had when he was in elementary school. As he worries, Nagisa Hazuki arrives and shows him a bunch of swimsuits and asks Rei to choose one. However, Rei cannot make up his mind; thus, Nagisa calls in Makoto Tachibana and Haruka Nanase to give their opinion on the matter. In the end, Rei chooses a silly looking Speedo and explains his choice to the others.

Characters
List of characters in order of appearance:
 * Rei Ryugazaki
 * Nagisa Hazuki
 * Makoto Tachibana
 * Haruka Nanase

Trivia

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