S1OVA1 Makoto's Problem!

Makoto's Problem! (真琴の悩み！Makoto no Nayami!) is the first original unaired short movie that came with Free! vol.1, which was released on September 11, 2013.

Synopsis
Nagisa Hazuki helps Makoto Tachibana understand Haruka Nanase's unusual behavior.

Story
Makoto reveals to Nagisa that he has great problems with Haruka stripping down to his swimsuit at the sight of water. He goes on to explain that when he went shopping with Haruka the day before, Haruka spotted a large fish tank, leaving Makoto behind, in order to strip and attempt to dive into the tank. When stopped, Haruka became quite irritated. To discover what triggers Haruka to behave in this manner, Nagisa devises an experiment.

First, Makoto cups his hands together and holds a bit of water in his palms. Haruka walks back, stares at the water, then scoffs as he turns and walks away again. Second, Makoto and Nagisa try a basin filled with water which catches Haruka's attention and even causes him to look back at it as he walks away. Third, the two experiment with a bucket and Haruka stares at it long and hard, causing Nagisa to comment that he looks like he is suffering. Fourth, a tub was used and this time Haruka nearly undoes his tie; however, at the last second he decides against it. Finally, Makoto blows up a small children's pool while Nagisa fills it with water, but before the two of them can finish putting the pool together, Haruka spots them from afar, strips, then quickly runs and jumps into the water.

Drenched, Makoto and Nagisa finally understand that Haruka needs enough water for his body to be submerged in before he will strip down.

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

Trivia

 * Prior to Free!'s English DVD release by Funimation the episode was called 'Makoto's Trouble!' in English