Hibana is married to Yuoshichi Okibi, a wealthy Capital factory owner, and mother to their daughter Kira. She lives within the Okibi residence, a nexus for pivotal political maneuvers and scientific pursuits. When Koushi's mother dies and his Fire Hunter father Haijuu vanishes, Yuoshichi shelters Koushi and his sickly sister Hinako. Hibana observes their transition into the household as Hinako enters the care of family physician Takimi. The Okibi family, including Hibana, engages in Yuoshichi's covert mission to refine "bottled lightning"—extracted from Fire Fiend blood—to control volatile skyfire energy. This project arises from Yuoshichi's conviction that rebel Spiders will topple the government and his theory that the ruling Divine Clans ignited a lethal Capital fire to purge the populace. Hibana's position intersects with broader themes of power and survival in a world where natural fire instantly incinerates humans.