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After being captured by the Dekaranger, Alienizer criminal Wojonian Jinche switches bodies with Hoji in a scheme to take over Dekabase.
The Dekaranger head to Kyoto, where they encounter an alien who learned the ways of Bushido from Ban's Shinsengumi ancestor and whom they must convince to return home without causing trouble.
A mad bomber Alienizer forces the Dekaranger to play in a game with the Earth at stake, where Kruger peculiarly makes Ban the participant who must run to defuse the targets.
The story begins when Banban Akaza arrives on Earth to the city of Megalopolis. He is transferred to the S.P.D. (Special Police Dekaranger) Earth branch by his commander. By that time, Agent Abrella, an Alienizer arms dealer, turns his destructive attention to Earth, helping the criminals there. It's up to the Dekarangers to stop them and bring them to justice. The S.P.D. of Earth are stationed in the Deka Base under the command of Doggie Kruger.