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?
Even when that happens, it doesn't 
mean Grandpa doesn't love you.
Auch wenn das so war,
liebe ich dich trotzdem noch.
Aunque lo haga,
no significa que te odie.
Aunque lo haga,
no significa que te odie.
Même si c’est le cas,
je t’aime toujours autant, tu sais.
Anche se fosse successo,
 guarda che non ce l'ho con te.
Mesmo se isso aconteceu,
não significa que deixei de amar você.
Даже если и так,
я тебя не перестал любить.