Um Drachen vor Bösewichten zu retten, die ihre Lebenskraft rauben wollen, setzen zwei Jugendliche aus verschiedenen Welten ihre neu entdeckten Ninja-Kräfte ein.

Nach dem Ende des Bürgerkriegs zwischen den Autobots und den Decepticons entsteht eine ganz neue Art von Transformers: die Terrans. Mithilfe von zwei Kindern lernen sie ihren Platz in der Welt kennen.

Young Kengo Manaka lives on Mars. As he lives out his peaceful, day-to-day life, the monster Golba suddenly appears, throwing the town into chaos! Meanwhile, Kengo has a fateful meeting with a giant stone statue sleeping deep beneath the ground on Mars. When Kengo becomes one with an Ultra-Ancient light, his destiny is forcefully thrown into motion!

Seven years have passed since Ultraman Trigger protected the world from various threats. In the present, Kanata Asumi, who is a positive young man, peacefully lives together with his grandpa. One day, while delivering ordered food, he witnessed a catastrophe: Spheres from the outer space attack Earth and Mars. Motivated by saving the precious lives of the people, he merges with Ultraman Decker and joins GUTS-Select, in order to protect what's important.