S1OVA4 Rei's Entry Training!

Rei's Entry Training! (怜の飛び込み猛特訓！Rei no Tobikomi Mou Tokkun!) is the fourth original unaired short movie that came with Free! vol.3, which was released on November 6, 2013.

Synopsis
The short begins with Rei Ryugazaki, dressed in his penguin Speedo, getting ready to jump from a diving block at the edge of the pool on the Iwatobi High School campus. Just as he dives, however, he suddenly wakes up during class and ends up rattling his desk which surprises and silences the entire classroom. Surprisingly, Rei had been daydreaming all along. Just behind him, Nagisa bursts out laughing to which Rei frantically yells at him to stop.

Characters
List of characters in order of appearance:
 * Rei Ryugazaki
 * Nagisa Hazuki

Trivia

 * Prior to Free!'s English DVD release by Funimation the episode was called 'Rei's Intense Diving Training!' in English