Sato functions as a bodyguard to Hiro, daughter of the demon lord Janus, within Neverland. A human, he exhibits unwavering dedication to Hiro's cause despite her initial deep-seated hatred of humanity stemming from her father's assassination by human rebels. His presence underscores Hiro's shifting perspective toward humans, as her personal guards and allies include individuals like Sato, challenging her biases. Sato's consistent loyalty portrays him actively supporting Hiro's leadership during the tumultuous First Neverland War.