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?
This might be end up being a long letter, 
but please bear with me to the end."
Das ist vielleicht eine lange Geschichte,
aber bitte nehmen Sie sich die Zeit.
Puede que me alargue,
pero lee hasta el final, por favor.
Puede que me alargue,
pero lee hasta el final, por favor.
Ça risque d’être assez long,
mais je vous prie de me lire.
La lettera potrebbe andare per le lunghe,
Возможно, строк будет много,
но молю вас, дочитайте до конца.