As Earth's apocalypse approaches, the injured GUTS-Select members puts their final plan into action in hopes to defeat Mother Spheresaurus. Will Kanata and the others be able to move forward to the future? And what awaits them there?
Several years after the world was saved by Ultraman Trigger, mankind has turned its gaze skywards to space. Suddenly, unidentified orbs dubbed "Sphere" invade. They begin their attack on Earth.
Ultraman Decker and the Terraphaser prove to be the ultimate duo. Kanata is overjoyed when the pair's successive victories increase their popularity around the world.
Eleking suddenly appeared in the city. Ichika meets a mysterious girl named Yuko at the scene. Recently, Eleking has been stealing and eating electricity, but is there any connection between the two?
Kanata meets a young girl, Mika. She says she wants Kanata/Ultraman Decker to fight her father? Her father is the Space Martial Arts Champion, Grace - Will the duel between Decker and Grace take place? And how will it end?
Kanata a.k.a. Ultraman Decker is thrown into another dimension by the extradimensional being Yapool. Just where in space has he been sent to? Kengo a.k.a. Ultraman Trigger comes to the rescue.
3 hours left until the Sphere Barrier starts to shrink. The 3 hours is the last hours of hope for humanity. To destroy the Sphere Obelisks, Kanata and GUTS-Select start a joint operation with TPU.