To avoid being forced into an arranged marriage, high school freshman Yuzuru Takasegawa gives his persistent grandfather an impossible condition: he will only consider a match if the girl is a beautiful, fair-skinned Japanese girl with blonde hair and blue eyes. To his shock, his family finds a candidate who perfectly matches his absurd demands. At the arranged meeting, Yuzuru discovers the prospective bride is none other than Arisa Yukishiro, a stunning and popular classmate known for her unique foreign features.

As they talk, both realize they are unwilling participants in a scheme orchestrated by their prominent families, who are eager to secure future alliances. Neither wants the burden of a fiancé during their high school years, so they strike a deal. To fend off future proposals from their families and other suitors, they agree to enter a fake engagement. The story follows Yuzuru and Arisa as they navigate the complexities of pretending to be a couple. They spend time together, eating meals and studying at each other's homes to sell the illusion, but what begins as a convenient arrangement gradually blurs the line between fiction and reality as genuine feelings begin to develop. The series, which completed its run from December 2020 to March 2024, focuses on their slow-burn romance as they transform from reluctant allies to true lovers.