Duel Marriage

It is revealed that the protagonist is actually an illegitimate child of a certain kingdom. And suddenly, a fiancée appears. She challenges the protagonist to a duel wagering their marriage. The method of the duel is an elegant one—whoever scatters the roses pinned to their chest wins. However... "Including what is called a duel, I look down on commoners." Toward a princess with the airs of a knight, the protagonist takes a drastic action to make her understand... This is a story of a protagonist who has steeled himself with the resolve of a samurai facing death, and a princess who underestimates what a duel truly is. ※Needless to say, this has no connection to actual laws or duels.