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?
It was Japan's Imaginary Science Research 
Institute that first announced that.
Das ist zum ersten Mal vom Labor verkündet
worden, in dem mein Vater arbeitet,
a été démontrée grâce à l’institut
des sciences spéculatives,
dei mondi paralleli
первым об этом заявил
японский институт мнимологии.