|Buildup of Early Spring!|
|Rōmaji||Soushun no Birudoappu！|
|Air Date|| June 23, 2018 (Event premiere)|
September 26, 2018 (DVD release)
|Opening||Heading to Over|
|← Forbidden All-Hard!||- →|
Buildup of Early Spring! (早春のビルドアップ！ Soushun no Birudoappu!) is an OVA released before the third season of the Free! anime was aired and is considered to be episode 0 of Free!-Dive to the Future-. It premiered in Japanese theaters on June 23, 2018, and was bundled with the DVD and Blu-ray releases of Free!-Dive to the Future- which were released on September 26, 2018.
List of characters in order of appearance: