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?
Well, it's not like we need to 
completely empty this room out,
Na ja, wir müssen dieses Zimmer
ja nicht komplett ausräumen.
Tu peux la laisser ici,
je n’utilise pas cette pièce.
Beh, non possiamo di certo lasciarla qui.
Bem, não precisamos tirar
tudo deste quarto, então...
Ну… комнату нам освобождать не надо,
можно на полку поставить.