Naito Naito, a second-year high school student who has the ability to survive in any situation, teams up with Ryuo Soya, a talented boy whose father is the head of the Ryuo Group conglomerate. Along with others, they challenge "Area Z," a game created by a genius known only as "Kurii Eita." Can they complete their mission to save the city within 6 hours? An original story based on the characters of Hayamine Kaoru's mystery novels.

A daytime alarm claims Ultraman Trigger is rampaging downtown. Kanata/Ultraman Decker races out, only to face a larger plot and a colossal enemy—teaming with Trigger and New Generation heroes to uncover who’s pulling the strings.