The Story of a Tsundere Nordic Female Classmate Going into Dere Mode as Soon as She's Announced as My Fiancée

"Renjo-kun, I want you to be my fiancé." Renjo Toru, who helped the most beautiful Nordic girl in school—Aino Luthi—at a bookstore, is suddenly asked by her to become her fiancé. At first, it was merely a request to avoid a political marriage, but once Aino learned that her partner was Toru, she suddenly became eager about marriage...!?