Haruko Yamada, a brown-haired young woman, stands among a close-knit group of friends united to confront supernatural dangers. Alongside Kakeru Miwa, Ryo Hattori, and Kaede Naruse, she battles oni—ravenous demons invading from another realm—using Yoroi, advanced combat armor blending archaic craftsmanship with cutting-edge innovation. Her teamwork proves vital in safeguarding shrine maiden Ouka Myojin and stemming the oni’s chaotic incursions.

Alliances with allies such as Benio Myojin, Ukon Kijima, and Issa Inuzuka bolster the group’s missions, culminating in a climactic clash against Masanori Myojin, the mastermind behind the catastrophic onslaught. Haruko joins her comrades in strategizing and executing the decisive strike to dismantle his destructive schemes. Post-conflict, she embraces tranquility alongside her peers, her life beyond collaborative battles and shared victories left unchronicled in recorded accounts.