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?
It's not healthy to let this 
keep a grip on us,
Wir können nicht für immer
wegen der Sache Angst haben.
No es bueno obsesionarse con aquello.
No es bueno
quedarse atascados en aquello.
On ne doit pas
rester bloqués sur l’accident.
Non fa bene arrovellarsi troppo
 su ciò che è successo.
Não é bom arrastar
aquele caso para sempre.
Нельзя зацикливаться на плохом!