Demoro, a young man of 20 years old, spends his days working in the mundane routine of a store, immersing himself in the worlds of anime and books in his free time. However, on the eve of Halloween, his life takes a dramatic turn when a mysterious figure in full samurai attire crosses his path. This enigmatic stranger becomes the key to the true destiny of the protagonist, as Demoro is revealed to be one of the chosen Avoltisu.