Within the notorious Yamato Gray Zone, known for its heavy acid rain contamination, nuclear fallout, and continuous volcanic eruptions - some of the worst pollution in the world - the Red Crow Hazmat Ronin remain faithful in their allegiance to the Cabinet and Republic. Their enemies include not only the terrorists raging in the hazard zones, but also bandits equipped with CBRN weapons. They show no hesitation in seeking them out to strike them down. To prepare themselves for entering the hazardous zone, they utilize specialized equipment to guard against chemical, biological, radiological, and nuclear (CBRN) threats. Fully aware that even the smallest tear to their protective gear could result in their demise, the fearless Red Crow Hazmat Ronin Squad ritually sever all ties with family and clans, saying goodbye to their former lives. Left with no chance to continue their own bloodline, they bear the responsibility of protecting the nation, and believe the spirit of the samurai will be reborn after their death.