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 once had someone talk to me about 
the significance of possibilities,
Vor langer Zeit hat mir eine Person
von der Bedeutung von Möglichkeiten erzählt.
Hace mucho, una persona me habló
del sentido de las posibilidades.
Hace mucho, una persona me habló
del sentido de las posibilidades.
Il y a longtemps, quelqu’un m’a parlé
de l’importance des possibilités,
Molto tempo fa
Давным-давно
мне пытались объяснить важность выбора.