|Rei, Theory, and Speedo!|
|Rōmaji||Rei to Riron to Buumeran!|
|Animation Director||Futoshi Nishiya|
|← Rei's Entry Training!||The Iwatobi Family! →|
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.
Rei Ryugazaki 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 Hazuki 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 Tachibana and Haruka Nanase to give advice. In the end, Rei chooses a speedo due to what Makoto had said.
List of characters in order of appearance:
- Prior to Free!'s English DVD release by Funimation the episode was called 'Rei, Theories, and Speedos!' in English