Fukurou to Tsugai-sama

Euphilia, the daughter of an earl, grew up without knowing the love of her family, as her younger sisters were given preferential treatment. She resolved to live without relying on anyone. One night, while resting alone in her room, she treated a small, injured owl. The next day, for some reason, she received an ardent marriage proposal from the emperor of a neighboring country...?! "I've found you. At last, I've been looking for you, probably since I was born." With melting eyes and sweet words, he ruthlessly eliminates anyone who gets in his way. Is this intense love too overwhelming?! This is the ultimate Cinderella story of a downtrodden girl and an emperor marrying!

(Source: Ichijinsha, translated)