A prequel to the 2013 Kyoto Animation series Free! which is an adaptation of light novel High☆Speed!
Unfortunately the movie High☆Speed!: Free! Starting Days is not yet available on HBO Max.
| Writing | Koji Oji | Original Story |
| Camera | Kazuya Takao | Director of Photography |
| Writing | Masahiro Yokotani | Series Composition |
| Sound | Yota Tsuruoka | Sound Director |
| Directing | Yasuhiro Takemoto | Director |
| Visual Effects | Yuka Yoneda | Color Designer |
| Writing | Maiko Nishioka | Screenplay |
| Sound | Tatsuya Kato | Original Music Composer |
| Production | Shinichiro Hatta | Producer |
| Editing | Kengo Shigemura | Editor |
| Sound | Shigeru Saito | Music Producer |
| Art | Akihiro Ura | Assistant Director of Photography |
| Visual Effects | Yuji Shibata | 3D Director |
| Art | Seiichi Akitake | Prop Designer |
| Visual Effects | Futoshi Nishiya | Character Designer |
| Visual Effects | Futoshi Nishiya | Supervising Animation Director |
| Production | Yoko Hatta | Executive Producer |
| Production | Yoko Kogawa | Executive Producer |
| Production | Shunji Inoue | Executive Producer |
| Production | Shinichi Nakamura | Producer |
| Production | Shigeru Saito | Producer |
| Production | Masayuki Nishide | Producer |
| Production | Susumu Okinaka | Executive Producer |
| Visual Effects | Futoshi Nishiya | Animation Director |
| Directing | Yasuhiro Takemoto | Second Unit Director |
| Directing | Taichi Ishidate | Second Unit Director |
| Directing | Taichi Ogawa | Second Unit Director |
| Directing | Haruka Fujita | Second Unit Director |
| Directing | Takuya Yamamura | Second Unit Director |
| Visual Effects | Takuya Yamamura | Key Animation |
| Directing | Noriyuki Kitanohara | Second Unit Director |
| Directing | Eisaku Kawanami | Second Unit Director |
| Visual Effects | Eisaku Kawanami | Key Animation |
| Visual Effects | Chiyoko Ueno | Animation Director |
| Visual Effects | Chiyoko Ueno | Key Animation |
| Visual Effects | Nobuaki Maruki | Animation Director |
| Visual Effects | Nobuaki Maruki | Key Animation |
| Visual Effects | Rie Sezaki | Animation Director |
| Visual Effects | Yuki Tsunoda | Animation Director |
| Visual Effects | Yuki Tsunoda | Key Animation |
| Visual Effects | Kohei Okamura | Animation Director |
| Visual Effects | Kohei Okamura | Key Animation |
| Visual Effects | Yuko Myouken | Animation Director |
| Visual Effects | Miku Kadowaki | Animation Director |
| Visual Effects | Shouko Ikeda | Animation Director |
| Visual Effects | Seiichi Akitake | Animation Director |
| Visual Effects | Seiichi Akitake | Key Animation |
| Visual Effects | Yoshiji Kigami | Key Animation |
| Visual Effects | Hiroyuki Takahashi | Key Animation |
| Visual Effects | Yoshinori Urata | Key Animation |
| Visual Effects | Hiroshi Karata | Key Animation |
| Visual Effects | Fumie Okano | Key Animation |
| Visual Effects | Kunihiro Hane | Key Animation |
| Visual Effects | Shinpei Sawa | Key Animation |
| Visual Effects | Nami Iwasaki | Key Animation |
| Visual Effects | Tomoko Yoshimura | Key Animation |
| Visual Effects | Tatsunari Maruko | Key Animation |
| Visual Effects | Sana Suzuki | Key Animation |
| Visual Effects | Akiko Takase | Key Animation |
| Visual Effects | Kota Sato | Key Animation |
| Visual Effects | Mariko Takahashi | Key Animation |
| Visual Effects | Ryouhei Muta | Key Animation |
| Visual Effects | Tatsuya Satou | Key Animation |
| Visual Effects | Kayo Hikiyama | Key Animation |
| Visual Effects | Minoru Ota | Key Animation |
| Visual Effects | Chinatsu Morimoto | Key Animation |
| Visual Effects | Maiko Hado | Key Animation |
| Visual Effects | Seiya Kumano | Key Animation |
| Visual Effects | Taira Yamaguchi | Key Animation |
| Visual Effects | Kanae Okura | Key Animation |
| Visual Effects | Hidehiro Asama | Key Animation |
| Visual Effects | Ayaka Nagahama | Key Animation |
| Visual Effects | Naoya Nakayama | Key Animation |
| Visual Effects | Ryosuke Shirakawa | Key Animation |
| Visual Effects | Ami Kuriki | Key Animation |
| Visual Effects | Sae Sawada | Key Animation |
| Visual Effects | Ryo Miyaki | Key Animation |
| Visual Effects | Shiho Morisaki | Key Animation |
| Visual Effects | Aoi Okuno | Key Animation |
| Visual Effects | Miho Kitaji | Key Animation |
| Visual Effects | Sayaka Watanabe | Key Animation |
| Visual Effects | Chiharu Kuroda | Key Animation |
| Visual Effects | Saeko Fujita | Key Animation |
| Visual Effects | Saeko Oofuji | Key Animation |
| Visual Effects | Kazumi Ikeda | Key Animation |
| Visual Effects | Tadashi Kashiwagi | Key Animation |
| Visual Effects | Kyohei Ando | Key Animation |
| Visual Effects | Keita Nagahara | Key Animation |
| Visual Effects | Yurika Ono | Key Animation |
| Art | Naoki Hosokawa | Background Designer |
| Art | Mutsuo Shinohara | Background Designer |
| Art | Shingo Kasai | Background Designer |
| Art | Tomoki Hiraishi | Background Designer |
| Art | Aki Yamatogi | Background Designer |
| Art | Momoka Hase | Background Designer |
| Art | Toru Hasegawa | Background Designer |
| Art | Sayaka Ichiyama | Background Designer |
| Art | Shouko Ochiai | Background Designer |
| Art | Tatsuro Onishi | Background Designer |
| Art | Mayumi Noguchi | Background Designer |
| Art | Ryoko Yamada | Background Designer |
| Art | Miyuki Hiratoko | Background Designer |
| Art | Ikuko Tamine | Background Designer |
| Art | Nozomi Oishi | Background Designer |
| Art | Yukiko Takeuchi | Background Designer |
| Art | Sagako Itakura | Background Designer |
| Art | Ayami Hidaka | Background Designer |
| Art | Marie Kitai | Background Designer |
| Art | Kouji Maruyama | Background Designer |
| Art | Etsuko Abe | Background Designer |
| Art | Ayano Kato | Background Designer |
| Visual Effects | Yuka Murakami | Key Animation |
| Art | Shinsuke Kinoshita | Background Designer |
| Art | Masakazu Koyama | Background Designer |
| Art | So Senoo | Background Designer |
| Art | Tomoe Chiga | Background Designer |
| Art | Lee Cheon-bok | Background Designer |
| Visual Effects | Tomofumi Sugitani | Key Animation |
| Art | Lee Mi-jin | Background Designer |
| Art | Kim Ji-hee | Background Designer |
| Art | Park Jung-ah | Background Designer |
| Art | Minami Kasuga | Background Designer |
| Art | Daiki Kuribayashi | Background Designer |
| Art | Saki Arakawa | Background Designer |
| Art | Sin So-yeon | Background Designer |
| Sound | Eiko Morikawa | Sound Effects |
| Visual Effects | Ryuuta Nakagami | 3D Animator |
| Visual Effects | Rin Yamamoto | 3D Animator |
| Visual Effects | Norihiro Tomiita | 3D Animator |
| Visual Effects | Tetsuo Umetsu | 3D Animator |
| Visual Effects | Kohei Funamoto | Compositing Artist |
| Visual Effects | Hiroki Ueda | Compositing Artist |
| Visual Effects | Teru Matsumoto | Compositing Artist |
| Visual Effects | Yoshiko Tanaka | Compositing Artist |
| Art | Joji Unoguchi | Art Direction |
| Crew | Sachie Tsuda | Special Effects |
| Art | Yasuhiro Takemoto | Storyboard Artist |
| Art | Taichi Ishidate | Storyboard Artist |
| Art | Taichi Ogawa | Storyboard Artist |
| Art | Haruka Fujita | Storyboard Artist |
| Art | Takuya Yamamura | Storyboard Artist |
| Sound | Satoshi Yano | Sound Recordist |
| Production | Keisuke Yokota | Production Manager |
| Production | Areum Han | Production Manager |
