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?
It's even hard for your Grandpa 
to figure out a simple explanation.
Mir fällt es auch schwer,
das einfach zu erklären.
Je peine à trouver
des mots simples pour te l’expliquer.
È difficile anche per il nonno
 spiegare tutto in modo semplice.
É difícil para o vovô explicar
isso de maneira simples.
Простыми словами
такое донести и мне сложно…