Kukuri Shirayama serves among the Twilight Priestesses, a trio of dark miko aligned with antagonist Michimune Ayatachi. Her spiritual capabilities rival those of the protagonist’s Miko Council, though her combat techniques demonstrate sharper precision. Introduced as a transfer student during a pivotal school term, she masks her true affiliations beneath a facade of shyness and social unease, while cultivating a subtle fixation on Tadahiro Amatsu—a mirror to the protagonist’s romantic investment in him.

Central to her role is her opposition to the Miko Council as a key figure in a faction seeking to resurrect the dormant Demon Lord. This group functions as a shadow counterpart to the protagonists, executing clandestine rituals and mystical confrontations that intensify the overarching conflict. Kukuri’s exchanges with Tadahiro and the protagonist intertwine competitive tension with shared emotional stakes, underscoring her dual position as both adversary and reluctant parallel to their struggles.