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?
I was really surprised to get a call 
from you all of a sudden.
Aber mich hat überrascht,
dass du mich auf einmal anrufst.
No esperaba que me llamaras así
de repente.
No esperaba que me llamaras así
de repente.
Quelle surprise, je ne m’attendais pas
à ce que tu me téléphones.
Mi è preso un colpo, sai?
Eu fiquei surpresa.
Ты меня, конечно, удивил!
Не ожидала, что вдруг позвонишь.