Aki Hayakawa is a key character in the anime series Chainsaw Man. He works as a Public Safety Devil Hunter and is part of Division 4, where he collaborates with the series' protagonist, Denji. Aki is known for his serious demeanor and strong sense of duty, often acting as the voice of reason within the group. His past is marked by tragedy, having lost his family to a devil attack, which fuels his determination to eliminate devils. Aki forms a contract with the Fox Devil and the Curse Devil, granting him unique abilities to combat supernatural threats.