To cure his unique condition, Bisco and Milo travel to the holy land of Shimane. But soon they come face to face with the ambitious immortal monk Kelshinha, who takes Bisco by surprise and steals his stomach! No longer immune to the rust eaters, Bisco, along with his partner Milo, must infiltrate the heart of Shimane to regain their original bodies before he bites the dust in five days. Will this dynamic duo be able to recover what they lost and send Kelshinha packing?