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 suppose I'm the only one 
who will suffer an impact, but still...
Na ja, Probleme hat er dabei
wohl nur mir gemacht.
Aunque probablemente
sea la única que no le consiente nada.
Aunque probablemente
soy la única que no le consiente nada.
Enfin, je suis sûrement la seule
à qui il en causait…
Beh, è anche vero che sarei stata l'unica
 a soffrire di questa sua scelta.
Bem, acho que sou a única que
vai sofrer com esse problema...
Впрочем… от его выкрутасов
разве что я немножко страдала.