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 man in my grandfather's altar
 photo wore a stern expression,
Das Gesicht von Großvater auf dem Foto,
das auf dem Schrein stand, war streng.
En la foto del altar,
el abuelo tenía cara muy seria.
En la foto del altar,
el abuelo tenía cara muy seria.
Le grand-père
de la photo sur l’autel
La foto del nonno esposta sull'altare
Meu avô tinha uma cara fechada
na foto que usaram no altar,
Лицо деда на фото, выставленном
 на алтаре, казалось мне недовольным.