Set in a post-apocalyptic world ravaged by warfare, 'Planetarian: Hoshi no Hito' follows a young scavenger known as a 'Junker' as he roams through a desolate city. During his exploration, he encounters a service robot in a secluded planetarium atop a department store. Despite his initial reluctance, the Junker decides to assist the robot in fixing the planetarium's projector, a choice that sets in motion a series of events that will alter their destinies forever. This adaptation seamlessly weaves together the storyline of the original visual novel with additional content from the 'Hoshi no Hito' light novel sequel, offering a poignant tale of companionship and hope in a bleak and unforgiving world.