Banbi is a human being that can "transform into a bear" when angry. When he was in elementary school, he kept himself from transforming after he knew the secret of the beast species. He met Ookuma who was the reason for his first time turning into a bear! Tormented by Ookuma, Banbi gets angry or sad ... the emotions he was suppressing were overflowing. "I hate you!" Although he thought that ... he saw the appearance of Ookuma, who was laughing with a broken heart and Banbi's emotions become a figure of a bear!