Hayato is one of the Idaten training under Rin, a new generation that was "summoned" by Rin about 80 years ago, but he is extremely brainless and only cares about becoming stronger himself. However, unlike Rin, who became strong out of a sense of responsibility towards the previous generation, and Prontea, who only became strong as a result of being beaten up, he has the potential to become the strongest as an Idaten who genuinely seeks power.