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?
"We have demonstrated 
the existence of parallel worlds."
El primer laboratorio en demostrar
la existencia de los mundos paralelos
El primer laboratorio en demostrar
la existencia de los mundos paralelos
L’existence des mondes parallèles
Il primo a riuscire a dimostrare l'esistenza
A primeira vez que anunciaram
"a prova da existência do mundo paralelo"