Zatch Bell!

Takamine Kiyomaro's life takes an unexpected turn when he stumbles upon a chance encounter with a tiny demon named Zatch Bell. Unassuming and detached from the world around him, Takamine finds his monotonous routine disrupted as he is tasked with caring for the lively, mischievous creature. However, what seems like an odd pairing quickly evolves into an exhilarating adventure as Zatch reveals his true nature - a participant in a high-stakes battle to determine the supreme ruler of the demon world. With each demon partnered with a human companion and bound together by a magical seal on their foreheads, these duos must engage in intense battles across the globe in order to claim victory and attain unparalleled power. As Takamine comes to terms with his new responsibilities and forges an unbreakable bond with Zatch, they embark on a thrilling journey filled with camaraderie, self-discovery, and life-altering challenges. Together, they navigate the treacherous world of demon battles, facing off against rivals who will stop at nothing to achieve ultimate dominance.