Momotaro
A peach was found in a mountain stream by a childless couple when they took the peach home and opened it Momotaro was born. Momotaro was born a perfectly formed if minute human boy. The couple raised him as their own. He grew up dutiful and brave.
His homeland was being marauded by a number of oni who lived on a nearby island. When Momotaro turned 15 he decided to do something about it. Before setting off on this self imposed mission his mother gave him some rice cakes. On the way he met a dog, a pheasant, and a monkey. They could all talk to each other and in exchange for a rice cake each they joined him on his mission. They found a boat and had an uneventful trip to the island of the oni.
On the island they met a group of women who had been kidnapped and raped by the oni. Momotaro told them that he would return them to their homes once he killed their captors. With his animal companions Momotaro attacked the oni castle and killed all the oni. The leader was slain by Momotaro in a one on one duel.
Momotaro freed all the human prisoners in the castle, loaded his boat with the oni treasure, collected the women and returned to the mainland without incident. The rescued were returned to their homes, and the treasure returned to its owner. There was enough wealth left over to ensure Momotaro’s foster parents lived in wealth for the rest of their lives.