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?
and went from being called "Mom" 
and "Dad" to "Grandpa" and "Grandma."
und wurden bald
nicht mehr Vater und Mutter,
Pasamos de ser papá y mamá
a abuelo y abuela.
Pasamos de ser papá y mamá
a abuelo y abuela.
et les « papa » et « maman »,
e da "papà" e "mamma"
De "papai" e "mamãe",
И затем в один момент из папы с мамой
преобразились в бабушку с дедушкой.