Decades ago, a being known as the Giant of Light joined together with Shin Hayata of the Science Special Search Party to save Earth from an invasion of terrifying monsters called Kaiju. Now, many years later, those dark days are fading into memory, and the world is at peace. But in the shadows a new threat is growing, a danger that can only be faced by a new kind of hero--a new kind of Ultraman...

As Shinjiro's resolve to be Ultraman continues to waver, a chance meeting with an old family friend and the wild and deadly Valky puts him on the path to discovering his reason to fight. But with a deadly new alien threat, Nackle's attempts to undermine Earthian faith in the Ultras, and the return of Temperor, will he find that reason before it's too late?