Planetarian: The Reverie of a Little Planet

"Planetarian: The Reverie of a Little Planet," also known as "Planetarian ~Chiisana Hoshi no Yume~," is a "kinetic novel" developed by Key. The story is set in a post-apocalyptic world where human civilization has declined, ravaged by nuclear war and biological weapons, leaving a harsh environment. A man known as "the Junker" stumbles into a well-preserved planetarium in an abandoned city, where he encounters a robot named Yumemi Hoshino. Yumemi is the planetarium's attendant, still following her pre-war programming to warmly welcome every "customer" and attempt to show them the stars. However, the planetarium's projector is broken. Through his brief time with Yumemi, the Junker is moved by her innocence and hope for the future. He attempts to fix the projector and learn about Yumemi's past, ultimately confronting a grim reality and carrying on with the memories Yumemi left behind. "Planetarian" is praised for its unique world-building, touching storyline, and beautiful music, and has been adapted into various forms such as anime and film.