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 all the more, I can feel that 
I spend my life loving Koyomi Hidaka.
Aber trotzdem fühle ich jetzt,
Aun así, me pasé la vida
amando a Koyomi Hidaka.
Aun así, me he pasado la vida
amando a Koyomi Hidaka.
Malgré tout ça,
Ma comunque,
Mesmo assim,
Ну и что с того?