Bucky is a unique kid at a college in Primas. Although no one listens, he talks about his dreams to rule the world all the time. One day a mad monster appears. Instead of calling the Great Child (G.C.) for rescue, Bucky tries to handle it by himself. He puts himself in danger, but the G.C. Spaak shows up to save him. Impressed by his extraordinary courage and determination to devote himself to realize his dream, Spaak names Bucky the G.C. of Primas and gives him the G. C. watch and the Spirit, Jibac. Then, Bucky proves his strength to his friends by defeating a trouble monster.