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Synopsis

After learning that a forbidden human experiment, once halted for its role in the Orochi's destruction, has been covertly resumed to bring back the sinister serpent, three brothers confront the unsettling truth. Their investigation reveals that former members of Yamainu, the Japanese military unit originally formed to eliminate the Orochi, are implicated in this clandestine plot. Facing betrayal and a resurgent threat, the siblings reunite and engage in combat against the military forces involved as they struggle to stop the attempt to revive the evil being.