Giant, mysterious creatures known as "Kaiju" suddenly appear in Japan, wreaking havoc and destruction. The government forms the S-Class Species Suppression Protocol (SSSP), a special task force intended to combat these formidable threats. As the team, led by seasoned officer Kimio Tamura, struggles to counteract the overwhelming power of the Kaiju, a luminous giant clad in silver appears from the sky. This extraordinary being, later referred to as Ultraman, swiftly defeats one of the monstrous invaders, saving countless lives and leaving humanity to speculate about its origins and intentions. Team member Shinji Kaminaga, an efficient but enigmatic strategist, catches interest in Ultraman’s repeated interventions and raises questions about the entity's connection to these terrestrial events.

As society grapples with the presence of both Kaiju and Ultraman, the team intensifies its investigation under growing pressure. As conversations about diplomacy and defense escalate, international interests get involved, each hoping to exploit Ultraman's presence for their own gain. Meanwhile, the arrival of another extraterrestrial, Zarab, complicates the already tense situation, with intentions that aren't immediately clear. As Zarab sends humanity deeper into chaos and manipulation unfolds on several fronts, the SSSP must deduce whom to trust. With the fate of the Earth hanging in balance, alliances are tested and secrets unveiled, leaving the team racing against time to find a solution amid a web of evolving threats. Through mounting adversities, they must align with Ultraman’s mysterious agenda or find themselves isolated against insurmountable odds.