A funny fantasy adventure about battling alien invaders from another world. Evil, the lord of the dark world, wants to conquer the human world. In Don Kurai, there is a legend of three riches and a hero, and Dark captures one of the three treasures, a copper bell, but a man sends the other two treasures (a gold spear and a silver shield) to the human world. Shinnosuke falls into Dark's trap and opens a portal between the human world and Don Kurai, yet he is chosen as the hero by the gold spear. The Nohara Family transforms into various creatures and fights Dark with the help of Mata Tami, a girl from Don Kurai.