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.
Kanata enters the TPU training school, and begins marching drills with classmates Ichika and Ryumon. However, he and Ryumon start butting heads after a difference in opinion.
A new aircraft GUTS Hawk deploys to GUTS-Select. To fully utilize its power, GUTS-Select need to coordinate with the Hawk's AI pilot, HANE2. But communicating with HANE2 proves a difficult task for Kanata and his teammates.
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?
A mysterious energy is detected underground. Could it be?. The power of darkness defeated ten years ago?. As Kanata and crew are stunned with shock, from the sky the legendary giant himself lands before GUTS-Select; Ultraman Trigger.
A mysterious giant plant appears and the pollen it spreads lures people into a world of dreams. But it looks just like R'lyeh, the plant Kengo Manaka grew to bring smiles to the people of Mars?. A familiar face shows up as Kengo, Kanata, and crew try to take control of the situation, and the GUTS-Select joint extermination operations begins.
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?
The mysterious monster Neomegas appears suddenly in town, defeats several other monsters, and leaves. Vice-Captain Kaizaki tries to find out what's really going out, when she remembers the words of her mentor.
Finally. Finally!. GUTS-Select are given with new equipment in the form of a robot. It's name is the "TerraPhaser"!. Everyone is excited to meet the robot they'd been waiting for, but for some reason monsters appear every time they try to test a boot-up sequence!. As Ultraman Decker holds off the monsters, can the team safely start-up the TerraPhaser?.
The Nursedessei's systems suddenly go down. A power-outage?. Who appears in this emergency but Marluru of the previous GUTS-Select team. Kanata and the crew are grateful for their seniors' timely appearance, but Marluru's sharp tongue leads to heated outbursts. Will Kanata and crew figure out how to work with Marluru and safely restore power to the Nursedessei?
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.
"Humanity must not venture into space..." Kanata and the others struggle to take in those words, but just then the small monster Spinnie appears, and a TPU all-member operation begins to capture it.
Captian Murahoshi is under investigation? The Director of the TPU's Internal Affairs, Agent Nigel, suspects Captain and Agams might be working together. Kanata is shocked, but Nigel shows no mercy and looks for any suspicious activity from Murahoshi. Why doesn't Nigel trust Murahoshi? Is there any way to clear Captain's name?
A sudden sinkhole appears in the city. Analysis shows it was caused by something beyond an average monster - Kanata, Ichika, and Ryumon head down to investigate where they encounter a mysterious shadow.
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.
An incident of an attacking from an unidentified monster takes place in a modern city, built where it which was once an ocean, Wadatsumi City. Kaizaki and Ichika are immediately sent to investigate.
The S-Plasma Breeder Reactor is a new technology in development. The tremendous energy it could produce has the potential to allow humanity to reach the speed of light.
Fugitive Agams suddenly reaches out to GUTS-Select and Captain Murahoshi is called to Agams' hideout alone. Finally, Agams reveals the truth of the shocking events from the future timeline. What does he mean by 'Earthlings' crime"?
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.
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?
