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?
The first time I made 
a major choice was when I was 7.
Ich habe meine erste große Entscheidung
mit sieben Jahren getroffen.
La primera gran elección que hice yo
fue a los siete años.
La primera gran elección que hice yo
fue a los siete años.
J’avais à peine 7 ans
quand j’ai dû faire
La prima grande scelta che abbia mai fatto
 fu quando avevo sette anni.
A minha primeira grande escolha foi feita
quando eu tinha 7 anos de idade.
Лично передо мной
первый крупный выбор встал…