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?
it's often because 
of a small Parallel Shift.
Kleine Parallelsprünge
verursachen so etwas oft.
Muchas veces se debe
a pequeños parallel shifts.
Muchas veces se debe
a pequeños parallel shifts.
un transfert parallèle
en est souvent la cause.
In casi come questi, spesso la causa
 è uno spostamento parallelo minore.
Зачастую это происходит
именно из-за смещений.