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?
At that top class feeder school, 
the atmosphere was not at all friendly,
In einer der besten Oberschulen hatte
niemand Lust, sich mit anderen zu beschäftigen.
En una de las mejores escuelas
no había tiempo para otros.
En uno de los mejores institutos
no había tiempo para otros.
Dans cette école préparatoire,
Non c'era spazio per pensare agli altri
Na escola preparatória de alto nível, os alunos
não estão no clima para dar atenção aos outros,
В одной из лучших подготовительных школ
у учеников не было времени друг на друга.