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?
Well, I mean, I don't know 
the you here at all,
Denn ich kenne ja
die Takigawa-san hier nicht.
Yo no conozco casi nada
a la Takigawa de este mundo.
Yo no conozco casi nada
a la Takigawa de este mundo.
Réfléchis.
E poi, se ci pensi,
Bem, eu não sei nada sobre a Srta. Takigawa
daqui e ela também não sabe nada sobre mim.
Ну ещё бы…