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?
When I try to put it into simple 
terms, that's just how it goes...
Um es einfacher zu sagen, ist das …
Puede que en palabras sencillas
suene así.
Puede que en palabras sencillas
suene así.
C’est pas facile de trouver les mots
pour l’expliquer…
Io non sarei in grado di spiegarlo bene
 in termini semplici.
Mas não consigo dizer se tento
colocar em poucas palavras...
Я пытался как-то попроще объяснить…
и вышло так.