While at the riverbank looking for fossils, Rintarou meets a boy named Toshi, and their days of adventure begins.
Unfortunately the movie Summer of Fossil Leaves is not yet available on HBO Max.
| Production | Shigeo Ishi | Supervising Producer |
| Writing | Toko Yatabe | Screenplay |
| Directing | Toko Yatabe | Director |
| Art | Toko Yatabe | Painter |
| Sound | Chiaki Hasegawa | Original Music Composer |
| Art | Ken Nakamura | Background Designer |
| Art | Kodai Ishikawa | Background Designer |
| Visual Effects | Toko Yatabe | Key Animation |
| Art | Mei Kamata | Background Designer |
| Art | Toko Yatabe | Background Designer |
| Art | Chihiro Goto | Painter |
| Writing | Toko Yatabe | Original Film Writer |
| Camera | Toko Yatabe | Director of Photography |
| Crew | Toko Yatabe | Cinematography |
| Editing | Toko Yatabe | Editor |
