Celebrating the 20th anniversary of the Tokusou Sentai Dekaranger series, the six detectives who fight with cool and burning hearts gather again to face the "Great Plan" that threatens peace on Earth!

Two years later, joined by rookie officers Assam Asimov and Mugi Grafton, who had taken over the positions of Deka Red and Deka Yellow respectively, Hoji, Sen and Umeko encounter a Clementian ...