To Every You I've Loved Before

Koyomi Takasaki, a university prep school student, lives with his mother after his parents' divorce. He's struggling to make friends due to his social awkwardness and the school's focus on studies. Kazune Takigawa, a classmate, reveals that she's from the 85th world where she and Koyomi are in a romantic relationship, setting the stage for their interaction across different parallel universes.