Official release of the visual novel Planetarian: The Reverie of a Little Planet developed by Key.
The anime adaptation of Planetarian aired, bringing the story to a wider audience beyond the visual novel.
Planetarian was released on the Steam platform, making it accessible to a broader international audience.
A global nuclear conflict erupts, devastating the world and causing the collapse of civilization as humanity knew it.
The Flowercrest Department Store and its attached planetarium are opened to the public, designed to educate and entertain visitors about the stars and astronomy.
The robot Yumemi Hoshino is activated to serve as a guide and attendant in the Flowercrest planetarium, designed to provide information and a comforting presence to visitors.
After the nuclear war, the city and the Flowercrest department store are abandoned; the planetarium ceases operations and becomes deserted.
The main character, a scavenger called the Junker, arrives at the abandoned Flowercrest store and discovers the still-functional robot Yumemi.
The Junker activates Yumemi, who believes the planetarium is still operational and continues her programmed duties.
They explore the deserted planetarium; Yumemi continues to educate the Junker about the stars, creating moments of hope amid desolation.
After spending time together, the Junker decides whether to help Yumemi continue her mission or leave, concluding their story.
