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The Dekarangers give Swan a day off to accept an award for her science work, but face difficulty without her around against a former S.P.D. scientist and his composite Kaijuuki.
The murder of a suspect in a thirteen-year unsolved cold case brings an old detective to Earth to solve the mystery, yet Jasmine discovers he may have lost something, or someone during his investigation, however, Jasmine is incapacitated by the very detective in charge of the investigation.
To complete his final exam for his Tokkyou license, Hoji must capture a deadly Alienizer who may be connected to his girlfriend.
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.