Netorare Angenica to Kichiku Hakushaku

Angenica's engagement is called off after her stepsister Veronica sleeps with her betrothed. On top of that, Veronica's engagement to the rumored "Brutish Count" is transferred to Angenica, forcing her into a suspicious marriage of unknown circumstances. After all the years of hard work Angenica had put into managing her family's estate after her mother passed away, she's now being driven out of her own home and into the arms of a man known as the Brutish Count Lloyd. Others that were engaged to the count are rumored to have gone mad and run away from him!

(Source: Hakusensha)