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 the front entryway of my home never 
opened for anything but the New Year.
aber in meinem Haus öffnete
sich die Vordertür nur zu Neujahr.
pero la puerta principal de mi casa
solo se abrió en Año Nuevo.
pero la puerta principal de mi casa
solo se abrió en Año Nuevo.
mais la grande entrée de ma maison
ma l'ingresso principale della mia casa
Mas a porta da frente da minha casa
Но вот двери моего дома
открывались только на Новый год.