Yūma belongs to the Gohongatana Clan, the Five Katana, a faction opposing the Imperial Army's objectives during the Taishō era. This group maintains ambiguous intentions towards the government while countering the military's pursuit of supernatural advantages. He operates within the clan's hierarchy under the command of Shigure. Yūma's involvement focuses on the conflict surrounding Hiiragi Kyoichiro, the protagonist gifted with the sight to perceive spirits of the deceased. The Gohongatana Clan, with Yūma, engages Kyoichiro due to the strategic value his supernatural ability holds amidst the escalating tensions between their faction and the Imperial Army.