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?
In that moment, the three versions 
of my grandfather finally merged together,
In diesem Moment
sind die drei Großväter in mir
En ese momento,
los tres abuelos se volvieron uno solo.
En ese momento,
los tres abuelos se volvieron uno solo.
À cette époque,
Quel giorno
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