Kazumichi Irie began his career under Haruki Enomiya in Myogadani’s abandoned zone, later shifting to the Public Safety Bureau’s Criminal Investigation Division as an enforcer. Mika Shimotsuki spearheaded his recruitment into the unit, integrating him into a team upholding the Sibyl System’s authority.

Renowned for a playful and irreverent charm, he cloaks his sharp wit in humor, though his true motives stem from a fierce dedication to Myogadani’s marginalized residents. His transition to enforcer emerged from a resolve to shield them from institutional abandonment and criminal exploitation. Initially wary of his assigned inspector, Arata Shindou, he gradually cultivates a bond marked by evolving trust and collaborative professionalism.

During Season 3, as a member of Division 01, he confronts politically charged conspiracies and organized crime syndicates. His assignments range from evaluating survivors of a downed transport drone to dismantling operations tied to the clandestine network Bifrost, demonstrating tactical flexibility and seamless integration into high-pressure team operations.

By Season 3’s fourth episode, he forges a strategic alliance with Akane Tsunemori, signaling his capacity to maneuver through the Sibyl System’s ethical and bureaucratic complexities. This partnership reflects his pragmatic grasp of systemic imperfections and his commitment to leveraging unconventional avenues for safeguarding vulnerable communities.