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 story of me and my world's 
Koyomi, Koyomi Hidaka.
y del Koyomi de mi mundo, Koyomi Hidaka.
y del Koyomi de mi mundo, Koyomi Hidaka.
Koyomi Hidaka.
Devo parlarti assolutamente di Koyomi Hidaka.
O Hidaka Koyomi do meu mundo.
О Коёми Хидаке, человеке из моего мира.