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?
From the moment they're born, 
people make countless choices.
Menschen treffen von ihrer Geburt an
unzählige Entscheidungen.
Los humanos hacemos incontables
decisiones desde que nacemos.
Los humanos hacemos incontables
decisiones desde que nacemos.
Dès leur naissance,
les humains font d’innombrables choix.
Dal momento in cui nasce,
As pessoas fazem inúmeras escolhas
desde o momento em que nascem.
С самого своего рождения мы,
люди, постоянно что-то выбираем.