Iyo Takahara serves as an alchemist within the Totensha organization, renowned for forging Gar-kun—a sentient wolf-shaped gargoyle bound to the mythic Philosopher’s Stone. She oversees an antique shop doubling as a workshop, where her advanced alchemical mastery produces artifacts imbued with supernatural capabilities. Gar-kun, her creation, first entered the Yoshinaga family’s care through a lottery, propelling him into his role as their steadfast guardian.

Throughout unfolding conflicts, Iyo equips protagonists with specialized tools like a helmet enabling communication with flora and counters threats tied to alchemy’s misuse, including clashes with factions such as Mizuchi, who hunt relics like the Balance of Rā. Her alliances extend to fellow alchemists like Hisham, architect of the mute gargoyle Osiris, as they unite to thwart adversaries endangering Goshikichō.

Her contributions center on resolving crises stemming from alchemical forces and sustaining Gar-kun’s protective duties, with her motivations and history remaining veiled beyond her professional engagements.