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 was just before my 
granddaughter Ai turned ten
Das hat mir der Arzt gesagt,
Cuando me lo dijo el médico,
Cuando me lo dijo el médico,
Le médecin me l’a annoncé
Il dottore mi diede questa notizia
O médico me avisou disso
Когда врач сказал о скорой смерти,