Yametaranese was a monster sent by Sasahiller in his plan to conquer the Earth without opposition by making all of humanity lazy and unmotivated. Yametaranese himself however was as his power portrays him, lazy. He was first discovered in a park by a lazy boy named Jiro, who rather than become lazy from Yametaranese, became hyperactive. Running around the city, Jiro spread Yametaranese's lazy radiation to several people around town in an epidemic-esque fashion, transforming everyone into acting lazy and unmotivated, according to Sasahiller's plan. Meanwhile, with an abundance of food nearby, Yametaranese quickly grew into a giant monster.