Françoise, the optimistic daughter of a ruined duchy, loses everything after her sister’s broken engagement with the crown prince. Still, she begins a peaceful life in the city, making sweets with her unmatched pastry skills. One day, she rescues a weakened slime on the roadside—only to discover it’s actually one of the legendary "Monster Dukes"! Now the Slime Duke wants her hand in marriage!? From ruined nobility to unexpected romance, a whimsical fantasy of sweet treats and even sweeter love begins!