A mysterious underwater explosion causes mass casualties in Tokyo Bay and initial investigations suspect a volcanic eruption. This assumption is quickly debunked when a giant tail emerges from the water, revealing an enormous sea creature that swiftly makes its way to land, leaving a trail of devastation. Government officials scramble to respond to the unprecedented threat, grappling with bureaucratic red tape and unpreparedness as the creature continues its rampage through Tokyo. Amidst the chaos, Rando Yaguchi, a young and determined deputy chief, assembles a team of experts to analyze the situation and devise a plan to counter the monster's growing threat.

As the creature undergoes rapid and alarming transformations, the team uncovers more about its origins and capabilities, realizing that conventional weaponry may be insufficient to halt its destructive path. With escalating damage and civilian casualties, international pressure mounts on the Japanese government to contain the crisis. Struggling against political inertia and limited resources, Yaguchi's team races against time to formulate an innovative and desperate strategy, hoping to prevent further catastrophe and safeguard humanity from this unprecedented menace.