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?
Research into time travel.
Das war die Forschung an Zeitreisen.
El estudio del desplazamiento temporal.
El estudio del desplazamiento temporal.
Elles concernaient
le voyage temporel.
Si trattava di una ricerca
 sullo spostarsi nel tempo.
Era uma pesquisa sobre o
deslocamento de tempo.
Тема — перемещение во времени.