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?
If you go there, you might 
remember something.
Wenn du hingehst,
erinnerst du dich vielleicht.
Puede que yendo recuerdes algo.
Puede que yendo recuerdes algo.
Tu t’en souviendras
peut-être sur place.
Magari se vai, ti ricorderai qualcosa.
Se você for, talvez se lembre.
Глядишь, вспомнишь всё на месте.