Hito Yonde, Ikemen Reijou.

Nicola Migras, the daughter of a viscount, is handsome and popular with women as the "handsome nobleman." However, Nicola is also a marriageable young lady. While searching for a husband for her family, her handsomeness has aroused the jealousy of men, and she has yet to find a husband. Then, a letter arrives from the royal castle...!? (Source: Kadokawa, translated)