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Lisa Teagle, a Tokkyou commander, comes to Earth to stop a special fire-manipulating Alienizer threat, as well as bring her student Tetsu back into the fold for losing his emotionless Tokkyou ways.
Umeko becomes trapped within a bizarre nightmare created by a dream-manipulating Alienizer, forcing Jasmine to solve the case before her soul is trapped away forever.
An assassin Alienizer transports Sen into a shrinking room, where he must figure out the means of his technique and a way out before being crushed in thirty minutes time.
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.