During Tasuku's absence in the monster world for rest and training, the Buddy Police chooses champions like Gao, Tetsuya, and Zanya Kisaragi to safeguard the Earth. This decision couldn't have come at a better time since Ikazuchi, a powerful enemy, has set free an army of rogue monsters called the 100 demons. Now, faced with the danger of planetary devastation, the freshly chosen trainees and the Great 8 monsters must join forces and battle these invaders to save the Earth.