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?
Happy 10th birthday, Koyomi.
 Don't point this at people or animals. 

-Grandpa
Felices 10 años, Koyomi.
No la apuntes hacia personas
o animales.

Abuelo
Felices 10 años, Koyomi.
No la apuntes hacia personas
o animales.

Abuelo
Ton papy
Tanti auguri per i tuoi 10 anni, Koyomi.
Però mi raccomando, non puntarla
 contro le persone o gli animali. 

 - Nonno
Parabéns por completar 10 anos, Koyomi.
Não aponte para pessoas ou animais, tá?

- Vovô
Поздравляю
с десятилетием,
Коёми.
Только
не наводи его
на людей
и животных!
Дед