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?
That's how similar our worlds are. 
They just don't seem 85 apart.
Das hat sich so gleich angefühlt, dass ich nicht
glauben kann, dass wir 85 entfernt sind.
No había nada raro.
No había nada raro.
Tout me paraît si normal,
Mi sembra assurdo slittare di 85 unità
Não há tanta diferença,
nem acredito que o valor seja 85.
Тут всё настолько знакомо,
что даже не верится в такой разрыв.