"Shutendoji" is a dark fantasy manga that blends elements of Japanese folklore, supernatural horror, and action. The narrative centers around Shutendoji, a legendary oni (demon) from Japanese mythology, reimagined as a powerful and enigmatic figure in a modern setting. The story begins with the resurrection of Shutendoji, who awakens after centuries of slumber to find the world drastically changed. His revival is tied to a mysterious organization that seeks to exploit his immense power for their own nefarious purposes.

The protagonist, a young woman named Aya, becomes entangled in Shutendoji's world after a chance encounter. Aya possesses a unique ability to sense and interact with supernatural entities, making her a target for both Shutendoji and the organization pursuing him. As the story progresses, Aya forms a reluctant alliance with Shutendoji, navigating a dangerous landscape filled with otherworldly threats, ancient curses, and hidden agendas. Their relationship evolves from one of mutual distrust to a complex bond as they uncover the truth behind Shutendoji's resurrection and the organization's true motives.

The plot delves into themes of power, identity, and the clash between humanity and the supernatural. Shutendoji's past is gradually revealed through flashbacks and encounters with other mythical beings, shedding light on his origins and the reasons for his imprisonment. The manga explores the moral ambiguity of its characters, with Shutendoji embodying both destructive tendencies and a sense of honor, while Aya struggles with her growing connection to the supernatural world and her own humanity.

Supporting characters include members of the organization, each with their own motivations and secrets, as well as other supernatural entities drawn to Shutendoji's power. The narrative is driven by a series of escalating conflicts, culminating in a confrontation that challenges the boundaries between good and evil. The manga's pacing balances intense action sequences with moments of introspection, creating a layered and immersive story. "Shutendoji" stands out for its intricate world-building, blending traditional folklore with a modern, gritty aesthetic, and its exploration of the complexities of its central characters.