Manga: Aesop's Tale

Synopsis (en anglais)

Aesop is a trouble-making young boy who finds himself in another world filled with creatures he never believed to exist, such as fairies and talking donkeys. He sets off to find a way back to the normal world. On his journey he befriends many classical creatures from well-known fables and encounters many trials, each teaching him a valuable lesson. (Source: Anime News Network)