The film adapts and expands the Planetarian visual novel by Key. The story is set in a dystopian future where biological and nuclear warfare has left a once prosperous civilization in complete ruin. The film tells the story of an old man travelling around with a mobile planetarium projector to show people the stars.
| Actor | Role |
|---|---|
 Tamio OhkiThe Man of the Stars (voice) | The Man of the Stars (voice) |
 Keiko SuzukiYumemi Hoshino (voice) | Yumemi Hoshino (voice) |
 Daisuke OnoThe Junker (voice) | The Junker (voice) |
 Sanae FukuLevi (voice) | Levi (voice) |
 Yoko HikasaJob (voice) | Job (voice) |
 Minami TsudaRuth (voice) | Ruth (voice) |
 Akiko TakeguchiEzra (voice) | Ezra (voice) |
 Yuuki KuwaharaJeremiah (voice) | Jeremiah (voice) |
 Shizuka IshigamiIsaiah (voice) | Isaiah (voice) |
 Satoshi TakiManager (voice) | Manager (voice) |
 Rina SatoSatomi Kurahashi (voice) | Satomi Kurahashi (voice) |
 Yasumichi KushidaGoro Mikashima (voice) | Goro Mikashima (voice) |
 Masaru ShinozukaOlder Junker (voice) | Older Junker (voice) |