A kind of magical gemstone maintains the stability and peace of the world, when a mysterious force is on the move and crisis spreads everywhere. Sheep and wolves and new partners to embark on the journey of guarding the world, racing against the mysterious forces of the conspiracy, and in the adventures and breakthroughs in the common growth, and ultimately understand the significance of the guardianship.

On a sunny day, Wolffy and Weslie on the green grassland, they start a battle of wits and courage around the captured Lazy Goat. At the critical moment, the Wolf Castle shakes violently, and is then inexplicably transported to an amusement park in the human world. In order to protect Ashitaka's family, the village headman uses a machine to transform them into humans. The unfamiliar human world makes them feel both strange and panicked, and they make countless jokes as a result. However, they discover a serious problem: their precious son, Ash, seems to be lost with them. On the other hand, Mr. Pi, an evil businessman who is planning to bring Wolf Castle to the human world, is brewing a series of evil plans full of ambition.

The Mighty Little Defenders receive an urgent call for help from the Land of Light and set out without hesitation on a perilous rescue mission, facing hidden conspiracies and powerful foes. Can the goats and wolves break through the darkness and restore the light? What fate awaits the Land of Light… The final battle between light and darkness is about to begin.