Planetarian: Storyteller of the Stars is a 2016 Japanese animated post-apocalyptic film directed by Naokatsu Tsuda. The film is based on the Planetarian: The Reverie of a Little Planet visual novel by Key and the "Man of the Stars" short story from the Planetarian light novel written by Yūichi Suzumoto. The film was animated by David Production and distributed by Asmik Ace. It premiered in Japanese theaters on September 3, 2016. The story is set in a dystopian future where nuclear warfare has left a once prosperous civilization in complete ruin. The film tells the story of an old man traveling around with a mobile planetarium projector to show people the stars.

Planetarian: The Reverie of a Little Planet is a Japanese post-apocalyptic visual novel developed by Key, a brand of Visual Arts whose previous works include Kanon and Air. It was released over the Internet on November 29, 2004, for Windows, and is rated for all ages. The game was later ported to the PlayStation 2 (PS2), PlayStation Portable and Nintendo Switch, as well as mobile devices. The story centers on a man who comes across a malfunctioning robot in a dead city. The man, known simply as "the junker", stays with this robot for a time and attempts to fix the projector of the planetarium where the story takes place.