To Every You I've Loved Before

In a world where people often drift between slightly different parallel realities, Koyomi Takasaki lives with his mother after his parents' divorce. He attends a local university prep school but struggles to connect with others due to the intense academic environment and his own social awkwardness. Then one day, his classmate Kazune Takigawa unexpectedly approaches him with a startling claim-she has come from the "85th world," where the two of them are lovers.