Juinbo, known as the Head Priest, serves within ancient Japanese mythological traditions. He confronts supernatural threats like dragons and the entity Hiruko, operating alongside the priestess Osayo to combat these forces. Juinbo's duties focus on protecting Terumi and guiding Koichi to harness the warrior-god Susanoo's power against emerging evil. His background intertwines with mythological conflicts, including Hiruko's resurrection and the eight-headed dragon. Specific narrative arcs feature his confrontation in "The Mystery of Hiruko" segment. Juinbo's motivations consistently align with fulfilling priestly responsibilities tied to ancient prophecies and mystical battles.