Set in the year 20XX, Oshaka School is renowned worldwide as a prestigious institution in Kamakuland, accepting only those with pure, untroubled minds who are descendants of Priest Sanzo's clan. The familiar villain trio is absolutely certain they are true heirs to Priest Sanzo's bloodline, even though their ancestry is highly questionable. They continue to study hard in hopes of gaining admission, despite failing over and over again.
One day, the principal summons three gifted children. Shakyamuni, who dwells within the principal's body, requests that they find the missing puzzle copperplates scattered across the globe and complete the puzzle board to elevate Oshaka School's prestige. Unfortunately, the villain trio overhears the conversation and resolves to beat the chosen youngsters to the prize. Along the way, they meet a remarkably clever boy named koochan, who seems useful to have around, and decide to take him along as they attempt to seize the copperplates from a goblin. At the same time, they try to recruit the goblin to their side so they can launch a joint assault on the heroes. But koochan sees through their malicious scheme, transforms into Itadakiman, and fights courageously to chase the wicked trio off.