Several years after Godzilla’s devastating first rampage, Koichi Shikishima has attempted to leave his wartime trauma behind. Determined to lead a quiet life, he focuses on rebuilding his family with Noriko and the young Akiko, hoping to step away from the nightmares of both war and monsters. However, this fragile peace is shattered when Godzilla returns. The creature has fully regenerated, emerging larger and more ferocious than ever before. To make matters worse, something ancient begins to stir beneath Aokigahara near Mount Fuji, threatening to push Japan into an even deeper crisis.

As the nation endures this double threat, Koichi is forced to break his promise of a peaceful life. He reluctantly returns to the fight, reuniting with old comrades from the previous conflict and joining forces with a U.S.-Japan military alliance. The stakes become intensely personal as Noriko develops a mysterious cellular connection to Godzilla, a remnant of her previous encounter with the monster. This connection strengthens throughout the narrative, pulling her dangerously closer to Godzilla’s uncontrollable rage and forcing Koichi to confront whether he can save his family from an enemy that lives within them. The story shifts focus from simple survival to a desperate race against time, exploring how the past refuses to stay buried as Koichi faces a Godzilla that has evolved beyond the creature he barely survived before.