The supreme leader of the Shepherds left a message: It is our greed that has caused the environment of the Shepherds to deteriorate and be on the verge of destruction. You are the last batch of surviving Cowherds. After wandering to Mercury Kingdom, you must bring humans back to Cowherd at all costs. Their blood is our only hope to save the environment. Please stay alive until you rebuild your home. This is an order!
Purpose: Protect the environment, for yourself and for all mankind!