Your Castle's Little Helper, Vol. 1 (light novel): Please feed me, I’ll work!

In the peaceful land of Frontera, a small child wastes away in a corner of the palace. But just before she starves to death, something else awakens inside her―the consciousness of a Japanese woman named Chihiro Sagami. To keep herself alive, Chihiro works hard doing anything she can! She’s adopted by a chef who assumes she’s an urchin, charges off into the forest in search of honey, and asks for udon when she gets sick. Chihiro is showered with love as she tears around the castle, where she’s given the nickname “the little helper.” And thanks to this one tiny girl, Frontera slowly becomes a country where kind people’s happiness is guaranteed.