The second Timeless Medley film mainly recaps Eternal Summer and a little bit of the first season. It focuses on Rin and Samezuka. It also includes new scenes and characters from High Speed.
Is Free!: Timeless Medley - The Promise on Netflix? Unfortunately the movie Free!: Timeless Medley - The Promise is not yet available on Netflix.
| Writing | Masahiro Yokotani | Screenplay |
| Sound | Tatsuya Kato | Original Music Composer |
| Directing | Eisaku Kawanami | Director |
| Visual Effects | Futoshi Nishiya | Character Designer |
| Art | Joji Unoguchi | Art Direction |
| Visual Effects | Yuji Shibata | 3D Director |
| Sound | Yota Tsuruoka | Sound Director |
| Camera | Kazuya Takao | Director of Photography |
| Art | Seiichi Akitake | Prop Designer |
| Production | Gen Fukunaga | Executive Producer |
| Sound | Daisuke Hirakawa | Theme Song Performance |
| Sound | Yoshimasa Hosoya | Theme Song Performance |
| Sound | Mamoru Miyano | Theme Song Performance |
| Sound | Kouki Miyata | Theme Song Performance |
| Sound | Nobunaga Shimazaki | Theme Song Performance |
| Sound | Tatsuhisa Suzuki | Theme Song Performance |
| Sound | Kenichi Suzumura | Theme Song Performance |
| Sound | Tsubasa Yonaga | Theme Song Performance |
