Ragna, the heir to a frontier noble family, is a reincarnated Japanese citizen who recognizes that the world he now lives in is the setting of an otome game. He initially dreams of a carefree, laid-back life, perhaps as an adventurer, but those plans are shattered when his father and two older brothers die in battle, leaving him as the unexpected head of the family. Forced to manage his inherited lands in a harsh frontier environment, Ragna struggles with unfamiliar lordly duties and the burden of continuing the family legacy.

His already chaotic life takes another abrupt turn when an arranged marriage is thrust upon him with a high-ranking noblewoman. To his surprise, his new bride is Alicia, the duke's daughter who is fated to be the villainess of the otome game he knows. In the game's original story, she is a character destined for heartbreak, a demonic pact, and ultimate destruction. However, upon meeting Alicia, Ragna discovers that she is actually extremely kind and capable. The source of her villainous role seems to be a product of the game's convenient plot rather than any genuine malice in her character.

As Ragna and Alicia gradually grow closer and form a genuine bond, darker forces begin to close in. Someone is actively targeting Alicia's life, and Ragna must use his knowledge of the game's events to protect her. The story follows their intertwined destinies as Ragna navigates the responsibilities of his territory, deals with the politics of noble society, and attends an elite academy in the capital alongside Alicia. He must ward off malign influences, uncover the truth behind the threats against his wife, and strive to rewrite the predetermined outcomes of this world in order to secure a peaceful life for both of them.