Gureo Haijima presides over Haijima Industries, the dominant conglomerate within the Tokyo Empire. His company wields significant influence over approximately 70% of the population through subsidiaries in clothing, food production, and restaurant operations. Haijima Industries manufactures all equipment for the Special Fire Force and directly controls Fire Force Company 5, using this access to advance its research goals. Founded after the Great Cataclysm, the company collaborated with Raffles I to build the Amaterasu perpetual thermal energy plant, central to Tokyo's power infrastructure. Haijima operates with pragmatic utilitarianism, prioritizing outcomes benefiting large populations even if they necessitate individual suffering. He authorizes lethal measures to achieve corporate objectives but will spare individuals should circumstances shift. He demonstrates a willingness for open collaboration when interests align, such as his alliance with Special Fire Force Company 8 against the Evangelist threat. Despite such cooperation, he continues pursuing Adolla Burst research through experiments on subjects like Nataku Son and Shinra Kusakabe. His involvement in pyrokinetic research includes overseeing Shinra Kusakabe for eight years at Haijima facilities after designing specialized liquid nitrogen shoes to control Shinra's abilities. Haijima later concealed Nataku Son within their Skills Development Laboratory following the awakening of his ignition abilities, misleading outsiders about Nataku's location. When Viktor Licht, Haijima's head of incendiary research, joined Company 8 under imperial order and investigated the Chinese Peninsula and the Amaterasu reactor's human sacrifice mechanism, Haijima executives planned his elimination. During the conflict at the Skills Development Laboratory involving Company 8, the Knights of the Ashen Flame, and Nataku's destabilizing powers, Haijima directly ordered Yūichirō Kurono to prioritize saving Nataku above all else. In the aftermath, he formalized an alliance with Company 8 Captain Akitaru Ōbi, offering resources to support Vulcan Joseph's development of an alternative power source to Amaterasu in exchange for cooperation against the Evangelist. This agreement included sparing Licht's life but maintained Haijima's intent to continue Adolla Burst research. Haijima Industries later deployed personnel, including Kurono and Director Oguru, to defend Tokyo's coastline against emerging Infernal threats over a three-month period, coordinating with Fire Force Companies 2 and 4. During the appearance of the eighth and final Stone Pillar near Tama Bay, Haijima's forces allowed Company 8 to confront the Infernal manifestation of Emperor Raffles I.