Hajime Shirogane, the Warrior of Martial Arts, previously commanded the ten warriors opposing the Demon King's forces in the feudal era. Leading through telepathic communication, he coordinated their efforts to seal the Demon King and subdue the Kyouma demons. Centuries later, as the Demon King's seal weakened, he and the other warriors were reincarnated in present-day Tokyo.

He retains his leadership role among the reincarnated warriors but champions a controversial stance advocating compromise and coexistence between humans and Kyouma, believing outright victory impossible. This position directly opposes Kyoshiro Kagami, the current de facto leader, who demands the Kyouma's total eradication. Hajime's peace proposal finds rejection from both the Kyouma, led by Lord Shindigan, and his fellow warriors, resulting in political and strategic isolation.

His physical appearance features a distinctive white military-style uniform, reflecting his authoritative past. While specific martial techniques remain undefined, his title as Warrior of Martial Arts implies significant close-combat proficiency. His telepathic abilities, essential for communication and coordination, persist as a key trait, though his influence is diminished due to the deep ideological rift with the other warriors.