When the Fallen Noble Lady Accidentally Picked Up a Slime… She Got a Proposal from the Slime Grand Duke!?

Franette, a duke’s daughter whose family has fallen into ruin after her sister’s engagement to the crown prince was annulled, faces misfortune with an unshakably positive attitude. Using her talent for making sweets, she begins a new, steady life in the downtown district.
One day, she happens to find a weakened slime on the roadside and takes it in. That simple act leads to an unbelievable turn of events — she receives a marriage proposal from none other than one of the great “Demon Grand Dukes,” the Slime Grand Duke himself!?