Bruce Mustang, who reincarnated as the eldest son of a rural noble. This is a fantasy world resembling one found in a story. He has lived this life earnestly, in his own way.

Characters in a story each have their own roles. Count Bruce Mustang of the Borderlands, scornfully known as the Lecherous Lord, is cast in the role of the 'Zamaa' enforcer – a perverted noble who marries the condemned villainess and inflicts outrages upon her.

Bruce, however, is completely oblivious to such a scenario. He was giddy with excitement over the beautiful bride who had fallen into his lap. Condemned... exiled... betrayed by allies...

As he meets characters from such unfortunate stories, Bruce's own tale begins to unfold.