The short film is about a boy who lives and works on a farm. One day when going to sell vegetables at a market, his cart breaks down. Two strangers, a frog and a mole, offer him a strange seed in exchange for the vegetables. The boy accepts and finds that the seed grows into a miniature planet. It continues growing as he tends to it, forming an atmosphere, weather systems and life. After being taken back to the city, he meets the stranger who sold the seed to him, and they release the planet into a galaxy of similar planets, where it will grow for years until becoming a real planet.
Unfortunately the movie The Day I Bought a Star is not yet available on HBO Max.
| Directing | Hayao Miyazaki | Director |
| Writing | Hayao Miyazaki | Screenplay |
| Writing | Naohisa Inoue | Original Film Writer |
| Visual Effects | Kenichi Yamada | Key Animation |
| Visual Effects | Takeshi Inamura | Key Animation |
| Visual Effects | Shunsuke Hirota | Key Animation |
| Visual Effects | Fumie Konno | Key Animation |
| Visual Effects | Moyo Takahashi | Key Animation |
| Visual Effects | Katsutoshi Nakamura | Key Animation |
| Visual Effects | Masako Sato | Key Animation |
| Visual Effects | Shinichiro Yamada | Key Animation |
| Visual Effects | Sachiko Sugino | Key Animation |
| Sound | Norihiro Tsuru | Original Music Composer |
| Sound | Yuriko Nakamura | Original Music Composer |
| Visual Effects | Michiyo Yasuda | Color Designer |
| Camera | Atsushi Okui | Director of Photography |
| Art | Yoji Takeshige | Background Designer |
| Editing | Takeshi Seyama | Editor |
| Production | Toshio Suzuki | Producer |
