Sanshoku Hirunetsuki Seikatsu wo Yakusoku Shitekudasai, Koushaku-sama

Please fulfill your end of our bargain, my Grace! Liscia, abused day and night by her stepmother, wishes for nothing but freedom. One day, she receives a shocking proposal for marriage from none other than a well-known, handsome noble, Duke Lindberd. Upon discussing his intentions, Liscia realizes that he's planning to have a fake wedding with someone who will not interfere with his privacy, just to get people off his back. Liscia agrees to marry him under one condition: Promise her a life with bare necessities, including three meals daily and a nap time! And now, let this be the first page of the duchess' diary of struggles, fighting for a life where she just wants to eat and sleep! (Source: POCKET COMICS)