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?
the impact on the academic world 
and society will be large.
les conséquences pourraient
être néfastes.
grosse ripercussioni 
nella comunità scientifica e nella società.
terá um grande impacto sobre a
sociedade em geral e científica.
И она может взбудоражить всё общество.