Heisei Restoration: The Wolves March On (2000)

Former Self-Defense Forces member Kikkawa encounters Korenaga, a man determined to avenge his wife after she was driven to suicide by a powerful criminal organization. Moved by Korenaga's desperation, Kikkawa recruits his former military comrades to help him seek justice. Their personal mission soon escalates into a full-scale confrontation with the Kurokawa Alliance, one of Japan's largest yakuza organizations, forcing the veterans to put their loyalty, combat skills and lives on the line.