Planetarian: The Reverie of a Little Planet (2016)

Set thirty years after the collapse of the Space Colonization Program, humanity teeters on the brink of extinction amid an unending, lethal Rain. In this desolate world, scavengers called "Junkers" sift through remnants of civilization. One such Junker ventures into the perilous ruins of a "Sarcophagus City," where he stumbles upon a forgotten planetarium. Inside, he meets Hoshino Yumemi, a companion robot who mistakenly believes he is her first visitor in three decades. Eager to showcase the stars, she quickly reveals the planetarium's projector is broken, prompting him to reluctantly help fix it.