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?
We spent many years together, 
always as research partners.
Als Forschungskollegen haben wir
eine lange Zeit miteinander verbracht.
Pasamos muchos años juntos
como compañeros de laboratorio.
Pasamos muchos años juntos
como compañeros de laboratorio.
Nous avons passé
pas mal d’années ensemble
Abbiamo trascorso molti anni insieme
Trabalhamos juntos por muitos anos
Просто долгие-долгие годы…
провели вместе над одним исследованием.