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?
but then it's there when you double-check,
und taucht wieder auf,
wenn man noch einmal nachschaut.
y vuelve a aparecer
cuando miramos de nuevo.
y vuelve a aparecer
cuando miramos de nuevo.
pour réapparaître
quand vous revérifiez,
e li ritroviamo lì dov'erano
 andando a dare una seconda occhiata.
mas quando conferimos
de novo, encontramos.
а потом перепроверяете —
и она снова на месте.