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 unilaterally viewed him as my rival.
Das war mir zuwider und ich
habe ihn als Rivalen gesehen.
Me convencí a mí misma
de que era mi rival.
Me convencí a mí misma
de que era mi rival.
J’ai fini par le considérer
comme mon rival.
Nella mia testa, 
lo inquadrai subito come un mio rivale.
Acabei vendo ele como um rival.
Он меня раздражал —
и я решила, что будет мне соперником.