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?
So, because of a momentary mood
 or whatever other reasons,
Darum machen die Leute
aus verschiedenen Gründen
Por eso a veces hacemos cosas
que entristecen a otros
Por eso a veces hacemos cosas
que entristecen a otros
C’est pour ça que les gens
chagrinent les autres
È per questo che le persone,
É por isso que as pessoas fazem os outros
ficarem tristes por um descuido
Поэтому бывает,
что из-за дурного настроения или обиды