Reiketsu Akujo ni Yoru Muku na Ouji no Riyouhou

Lido Etoile, the youngest son of the royal family, grew up oppressed because he was born to a concubine. One day, he is ordered to become engaged to Sheila Valley, the eldest daughter of the most powerful duke in the country, who is rumored to be a "ruthless villain." Lido is terrified of marrying a villain, but Sheila's personality is completely different from the rumors...?

(Source: Ichijinsha, translated)

Notes:

- Originally published as two short stories in volumes 2 and 3 of the anthology "Akuyaku Reijou desu ga, Shiawase ni Natte Misemasu wa! Anthology Comic Zamaa-hen"

- Includes one extra chapter.