326 pages; softcover.

In a world where people regularly travel between slightly different parallel universes, Koyomi Takasaki lives with his mother after his parents' recent divorce. Awkward and studious, he has trouble making friends at his new school, until his classmate Kazune Takigawa seeks him out. She claims that she's moved here from another world where she and Takasaki are lovers... But could he be the one who’s actually from a parallel world?

To Every You I've Loved Before and To Me, The One Who Loved You are parallel universe novels by the same author and released on the same day. They can be read in either order to complement each other, and inspired a pair of anime films (also released on the same day).