The film will be a "reconstruction" of the Free! Dive to the Future television anime series, but with an added "new episode."
| Actor | Role |
|---|---|
 Nobunaga ShimazakiHaruka Nanase (voice) | Haruka Nanase (voice) |
 Tatsuhisa SuzukiMakoto Tachibana (voice) | Makoto Tachibana (voice) |
 Tsubasa YonagaNagisa Hazuki (voice) | Nagisa Hazuki (voice) |
 Daisuke HirakawaRei Ryugazaki (voice) | Rei Ryugazaki (voice) |
 Mamoru MiyanoRin Matsuoka (voice) | Rin Matsuoka (voice) |
 Yoshimasa HosoyaSosuke Yamazaki (voice) | Sosuke Yamazaki (voice) |
 Kouki MiyataAiichiro Nitori (voice) | Aiichiro Nitori (voice) |
 Jeff ManningAlbert Volandel (voice) | Albert Volandel (voice) |
 Koki UchiyamaIkuya Kirishima (voice) | Ikuya Kirishima (voice) |
 Ryohei KimuraHiyori Tono (voice) | Hiyori Tono (voice) |