ツンデレ北欧美少女のクラスメイトが、婚約者になった途端にデレ一辺倒になってしまった件について

"Renjo-kun, I want you to become my fiancé." Toru Renjo, who helped Aino Lyuti, the Scandinavian girl rumored to be the cutest in school at a bookstore, was asked to become her fiancé. At first, it was a request to avoid a political marriage, but once Aino realized that Toru was the intended partner, she quickly became eager for the marriage...!? This is the story of two people who were supposed to be only engaged in name, but gradually come to understand each other and become true lovers.