Yokai …Japanese spirits. Most people fear them, and a few people even hunt them, thinking they are horrible monsters to be destroyed at all costs. But young Hamachi wants to be friends with them! He sees them as mischievous creatures that could coexist peacefully with humans if only given a chance. When his grandmother dies under mysterious circumstances, Hamachi journeys into the Yokai realm. Along the way, he encounters an ogre who punishes truant children, an angry water spirit, and a talking lantern. Will Hamachi be able to find his grandmother's killer, or will he be lost forever in another world?

Yokai are Japanese spirits, and young Hamachi is fascinated by them. Now he continues his quest deep into the Yokai realm in the hopes of finding Madkap, the kappa (water spirit) he believes has killed his grandmother. Armed with nothing but a sacred rope and a lucky kappa’s foot, Hamachi has made two friends to help him on his Lumi the talking lantern, and newly awakened, the umbrella that once belonged to his grandfather! (Don’t ask.) Their first stop is the home of the legendary fox spirit the Ninetails, who promises to help in Hamachi’s quest if Hamachi can retrieve three lost items. But can Hamachi really find them, or does the Ninetails just want Hamachi to fail so he can keep the human boy as a pet? Includes special extras after the story!