I Picked Up a No-Good, Useless Prince

Kuruhi, first prince of Gahama Kingdom, is the epitome of a spoiled brat with his arrogant attitude and behavior. After countless misdeeds, he is finally banished from the royal family and reduced to a commoner!
The wandering, mud-covered former prince finds himself at an inn run by Emma, a girl who has a severe obsession with royalty drama. Emma is bewildered by the sudden appearance of her "Oshi", and determined to get him back on his feet, she embarks on a grand project!

(Source: ComicGardo, translated)