Genson! Kodai Seibutsu-shi Packy

One day, elementary student Takeru meets a very strange new friend-- a Pachycephalosaurus named Packy! He's traveled from "The Lost World," a place where extinct animals live together. Packy loves head-butting things, and he's traveling to discover the perfect head-butt target. Now Packy may end up living with Takeru, his older sister, and his parents in their modern-style home. However, Packy is not the only creature to come out of the Lost World, and other creatures may have much less friendly...