Benio Myōjin, eldest daughter of the Myōjin shrine maiden lineage charged with sealing humanity-threatening oni, serves as both protector and older sister to Ōka Myōjin, the prophesied world-savior. Hailing from Aichi Prefecture, her silver hair and slender frame complement a demeanor noted for its unflappable composure. Commanding a dedicated team separate from her sister’s allies, she confronts oni through martial skill and tactical precision, offsetting her lesser innate power. Her squad thrives under the synergy of Ukon Kijima, a jovial strategist, and Issa Inuzuka, a stoic combatant, their loyalty cementing her leadership.

Benio’s bond with Ōka is defined by deep, albeit unreciprocated, affection. She upholds steadfast routines—daily greetings, unwavering doting—yet privately wrestles with the sting of asymmetry in their relationship. This emotional tension mirrors her broader struggle to reconcile familial devotion with her sacred duty.

Her father, Masanori Myōjin, the architect of their familial fracture, emerges as her antithesis: a manipulative defector who exploits oni to sow chaos. His betrayal casts Benio’s mission in dual light—a battle against supernatural forces and a reckoning with paternal legacy.

Guided by resolve, Benio navigates the collision of duty and desire, her choices anchored in safeguarding humanity even as she contends with the shadows of kinship and sacrifice.