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?
A whole lot of time has 
passed now, hasn't it?
Es ist schon viel Zeit vergangen.
Ya pasó bastante tiempo.
Ya ha pasado bastante tiempo.
Tu as déjà perdu assez de temps
comme ça.
È passato troppo tempo.
Já se passou muito tempo.
Уже ведь много лет прошло?