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?
He only repeated that 
the accident wouldn't happen
Aber wenn es eine Welt ist,
in der sie sich nicht treffen,
Solo repite que en un mundo
en el que no se conozcan,
Solo repite que en un mundo
en el que no se conozcan,
Je sais juste
Ma mi ripeteva sempre
Mas ele repete que se for em um
mundo onde os dois não se encontram,
Разве что…