Yukinojyo Onikura emerges from Japan's Sengoku period as a warrior monk of Ishiyama Honganji, the era's primary monk stronghold, having fought against Oda Nobunaga in the 1570 conflicts. His imposing frame features extensive tattoos across body and face, including the stark inscription "evil" upon his forehead. A shaved head and traditional attire—monk's robe, Buddhist prayer beads worn on hands and neck, and distinctive tengu geta footwear—anchor his historical origins.

Bold and resolute yet underpinned by delicacy, Onikura awakens in 2030 atop a rooftop in a virus-devastated Japan. He intervenes when Gibia monsters attack a group, using a wire from Kenroku Sanada to pull their helicopter to safety, securing his place within the survivor faction led by Dr. Yoshinaga and Kathleen Funada.

In combat, he wields Douzan—a massive spiked metal club inherited from an unnamed companion—leveraging brute strength to crush Gibia foes. He accompanies the group's quest for a Gibia virus cure, confronting threats from both monsters and human outlaws, though his journey beyond this initial alliance remains uncharted in documented accounts.