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?
That fact that you're here means 
you knew what the picture was.
Da du hier bist, hast du gewusst,
was auf dem Bild war.
Si viniste es que sabías
de dónde era el dibujo.
Si has venido es que sabías
de dónde era el dibujo.
Si tu es venu là, c’est que
tu connaissais l’endroit du dessin.
Se sei venuto qui,
Se veio aqui,
Раз ты сюда приехал…
значит, знал, что Рё рисовал?