Zatch Bell!

With each battle, Kiyomaro and Gash face formidable opponents, testing their bond and skills. Along the way, they discover that Gash's abilities and powers are not the only factors that determine their success. The strength of their partnership and the importance of friendship become the keys to their victories. As Kiyomaro evolves as a person, he learns to appreciate the value of his relationship with Gash and the other partners, leading him to become a true champion in the fight for the demon world's throne.