Hell Dogs: Jigoku no Inu-tachi

A man who has spent three and a half years as a yakuza member continues his deep undercover work. Kanetaka, a rising member of the Higashi-Sheath Association known for his strength, was sent to Okinawa by his organization to eliminate a target named Kino. After completing the mission, he experiences violent vomiting. It is later revealed that he was originally a police officer. His actions raise questions about his true intentions and the nature of his assignment.