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?
Sorry to interrupt the fun, 
but we'd better get going.
Ihr habt’s ja lustig,
aber wir müssen langsam gehen.
Siento interrumpir la diversión,
pero hay que irse.
Siento interrumpir la diversión,
pero hay que irse.
Désolé de vous interrompre,
mais c’est l’heure.
Vi state divertendo, eh?
Parece divertido,
mas está na hora de sairmos.
Не хочется мешать,
но нам пора ехать.