While struggling to make friends after his parents’ divorce, Koyomi Takasaki meets Kazune Takigawa, but apparently, they already have. Kazune reveals that she’s from World Line 85, an alternate universe in which she and Koyomi are lovers. But in a reality where moving between dimensions is natural, could Koyomi be the one from another world?
As I was saying, you had 
the top entrance exam scores,
Du hattest das beste Prüfungsergebnis,
Tuviste las mejores calificaciones,
Tuviste las mejores notas,
Écoute-moi, Takasaki !
Insomma, voglio dire,
Estou falando que você passou
em primeiro no vestibulinho
Говорю же!