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?
The ability to keep the two 
bubbles from separating...
Eine Kraft, die die beiden
Blasen zusammenhält …
Algo que impide
que las burbujas se alejen…
Algo que impide
que las burbujas se alejen…
Une force qui maintiendrait
ces deux bulles ensemble…
Una forza che impedisce a due bolle di separarsi...
Um poder que evita que
as duas bolhas se afastem.
Сила, которая удерживает
две волны ряби.