Written and illustrated by Masashi Tanaka

Gon goes underground in this book length adventure. Things start out small, as Gon fixates on an anthill. From there, he defends a colony of prairie dogs from a mother coyote and her cub. Enemies become allies when an earthquake opens up a huge fissure, sending Gon and his companions into a mysterious, underground world filled with strange creatures. Will a giant spider prove to be Gon's match?