Takimi is the Iruka family doctor, tasked with providing medical treatment to their young charge, Hinako, residing in the household of wealthy industrialist Yuoshichi Okibi alongside her brother Koushi. His role expands beyond standard medicine into ethically complex experimental procedures tied to the divine clans' covert operations. These procedures involve genetic engineering to forcibly alter humans, enabling survival without fire-based energy—a necessity due to historical calamities causing humans to combust near natural flames. Takimi conducts trials with a potent transformative drug, exhibiting relentless, near-obsessive commitment. His actions intensify during clashes between rebel factions and divine clans. In a critical encounter, he attempts to inject his experimental serum into multiple individuals, including the hunter Roroku. Even after losing an arm in the conflict, Takimi maintains unsettling resolve, controlling the severed limb to continue the injection attempt. His experiments ultimately serve a hidden objective connected to Tayurahime, a central divine clan figure whose existence is prolonged by fire hunting rituals harvesting pure fiend fire. Takimi's work supports this system. His persistent efforts to keep Hinako under his care stem from her status as a successful outcome of the Water Clan's human experimentation program, making her vital to his research.