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?
Look, I'm not saying it's 
a good reason, but...
Das ist zwar kein Grund dafür,
No es que sea por eso, pero…
No es que sea por eso, pero…
Ce n’est pas vraiment pour ça…
Non che c'entri qualcosa...
Não é que eu esteja dizendo
que seja por causa disso...
Не подумай, что из-за этого…