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A professor studying folklore opened a banned book and was possessed by a Japanese ancient lightning demon, who is determined to return to and rule the world. The Superpower Research Defense Bureau sends Hellboy and a team of agents to investigate the case. During the process, when Hellboy picks up a samurai sword, he enters a world filled with various ghosts and monsters from Japanese legends. Agent Kate Corrigan and Russell Thorne begin tracking the possessed professor in an attempt to find and bring Hellboy back to the human world.