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?
I don't have it. I know it. 
I call it all the time.
Die hab ich mir gemerkt,
weil ich sie immer anrufe.
Sí. Me acuerdo. Te llamo siempre.
Sí. Me acuerdo. Te llamo siempre.
Je m’en souviens, oui.
En même temps, je t’appelle souvent.
Più che conoscerlo direi che lo ricordo,
Bem, eu sei, porque eu lembro.
Я его наизусть помню,
постоянно же тебе звоню.