In an age of epic samurai battles, one warrior must hunt down and destroy powerful demonic forces to reclaim his humanity and uncover the secret of his father's betrayal. Based on the classic story by legendary Japanese manga pioneer Osamu Tezuka.

Ash and his friends journey into the mysterious realm of Reverse World, an alternate dimension that reflects and distorts the normal one. While they initially set out to help Shaymin, a lost Pokemon, get back to its home, the team stumbles across a plot by a scientist to overthrow Reverse World. Now they must figure out a way to protect the strange dimension from complete destruction, and make it back to their own world in one piece.