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?
and just like that, our 
private bubble was popped.
und unsere Zeit zu zweit verschwand.
Il nostro spazio privato
 si andò lentamente sgretolando.
e o espaço que era apenas nosso,
foi facilmente quebrado.
В итоге я перестал оставаться
с Кадзунэ наедине.