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Houji's perfect investigation record is put to the test when he gets caught up in an investigation of a kidnapped alien princess.
Three mysterious machines crash-land on Earth, forcing the Dekarangers to investigate what they are and for what purpose they're for before their diabolical impact is unleashed on the populace.
After his perfect record seemingly becomes tarnished by an Alienizer getting away with the princess and the Wellness Stone, Hoji and Ban pursue Rikomoian Kevakia into virtual reality in order to find a way to defeat the virtual criminal.
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.