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 I can't really help it if
 I'm different from your Koyomi.
Aber ich kann nichts dafür,
dass ich anders als dein Koyomi bin.
Pero es normal
que sea distinto a tu Koyomi.
Pero es normal
que sea distinto a tu Koyomi.
C’est normal que je sois différent
de celui que tu connais !
Però non posso farci niente
 se non sono come il tuo Koyomi.
Mas não há o que fazer se sou
o Koyomi que você conhece.
Только… естественно, я не такой,
как твой Коёми.