While at the riverbank looking for fossils, Rintarou meets a boy named Toshi, and their days of adventure begins.
| Directing | Touko Yatabe | Director |
| Writing | Touko Yatabe | Screenplay |
| Production | Shigeo Ishi | Supervising Producer |
| Sound | Chiaki Hasegawa | Original Music Composer |
| Visual Effects | Touko Yatabe | Key Animation |
| Art | Touko Yatabe | Background Designer |
| Art | Ken Nakamura | Background Designer |
| Art | Kodai Ishikawa | Background Designer |
| Art | Mei Kamata | Background Designer |
| Art | Chihiro Gotou | Painter |
| Art | Touko Yatabe | Painter |
| Writing | Touko Yatabe | Original Film Writer |
| Editing | Touko Yatabe | Editor |
| Crew | Touko Yatabe | Cinematography |
| Camera | Touko Yatabe | Director of Photography |
