Seven years have passed since Ultraman Trigger protected the world from various threats. In the present, Kanata Asumi, a positive young man, lives peacefully with his grandfather. One day, while delivering food orders, he witnesses a catastrophe: Spheres from outer space attack Earth and Mars. Driven by the desire to save precious lives, he merges with Ultraman Decker and joins GUTS-Select to protect what matters most.
