Ragna, heir to a frontier noble family, is actually a reincarnated former Japanese citizen who finds himself in the world of an otome game he once knew. While all he wants is to live a laid-back and peaceful life, managing his unfamiliar territory constantly keeps him on his toes. To make matters worse, his marriage is suddenly arranged with a noblewoman of higher rank. To Ragna's surprise, his new bride, Duchess Alicia, turns out to be the infamous "villainess" from the otome game world! What twists await as Ragna navigates both his marriage and this unpredictable game-like reality?