To Every You I've Loved Before

The film follows high-school student Koyomi Takasaki meeting Kazune Takigawa, who reveals to him that he is her boyfriend in the 85th parallel world. Its companion film, To Me, the One Who Loved You, depicts an alternate version of Koyomi, named in that world as Koyomi Hidaka, and Shiori Satō who both fall in love with each other, but their parents' remarriage has led them to elope to another parallel world where they are not stepsiblings.