To Every You I've Loved Before

A heart-tugging story of young love that transcends parallel worlds! To Every You I’ve Loved Before and To Me, The One Who Loved You (also from Seven Seas): two novels, one multiverse–and don’t miss the two anime films!
In a world where people regularly travel between slightly different parallel universes, Takasaki Koyomi lives with his mother after his parents’ recent divorce. Awkward and studious, he has trouble making friends at his new school until his classmate Takigawa Kazune seeks him out. She claims that she’s moved here from another world where she and Takasaki are in love… but could he be the one who’s actually from a parallel world instead?

[From Seven Seas Entertainment]