In a modern world shadowed by yokai and curses spawned from human despair—much like the jujutsu battles of old—Zane Ryujin emerges as a rogue half-demon warrior. Born from a forbidden union between a jujutsu sorcerer mother and a powerful oni demon, Zane inherited crimson eyes that detect hidden spirits and a muscular frame scarred from early battles against his father's kin. Orphaned young, he honed his abilities in hidden dojos, rejecting his demonic side to protect the innocent. Now a wandering hunter, he dons a simple vest and pants, confronting curses in urban alleys with raw power and inherited techniques, seeking redemption for his bloodline.