Chikage Ōgi, grandmother to twin exorcists Shōko and Maiko, leads the Ōgi clan. For centuries, this family has guarded Japan under the deity Karura's patronage. Officially retired, she still ignites spiritual power and offers crucial guidance during her granddaughters' pivotal moments. She supported them in their first major clash within Nara, a confrontation that exposed a conspiracy of cursed spirits and a priest's plot to dominate Japan. Her leadership anchors the twins to their hereditary duties and their lineage's deep spiritual legacy.

Chikage's influence reaches beyond direct action, aiding the twins in forging alliances with powerful spirits like the ancient onryō Wani, who becomes their fierce protector. Her presence ensures the clan's enduring continuity and the vital passing of ancestral knowledge down the generations. She embodies the Ōgi family's profound historical weight and authority within the eternal conflict against supernatural darkness.

Her role stays firmly advisory and foundational, not combat-focused, highlighting the clan's persistent resistance against recurring evil. She surfaces in contexts demanding ancestral techniques and strategic wisdom during the twins' investigations into supernatural disturbances. Chikage Ōgi personifies the unbroken chain of intergenerational responsibility defining their exorcist heritage.