In 1999, a devastating attack by a new Godzilla leaves Japan in ruins. During the chaotic battle, military searchlight operator Akane Yashiro accidentally causes a tactical error that leads to her comrades' tragic deaths. Blamed for the disaster, Akane is demoted, leaving her burdened by intense guilt and isolated from her peers. Seeking a definitive defense against the radioactive titan, the Japanese government recruits brilliant scientist Tokumitsu Yuhara to spearhead a revolutionary project. Using the skeletal remains of the original 1954 Godzilla, they construct Kiryu, a state-of-the-art Mechagodzilla equipped with the devastating Absolute Zero Cannon.Akane is recruited to the elite squad assigned to pilot Kiryu, viewing the assignment as her sole chance at redemption. However, during Kiryu's maiden battle, Godzilla’s roar triggers the dormant
genetic memory within the cyborg’s organic computer. The bio-mechanical giant goes berserk, ignoring all commands and turning its weapons on the very city it was built to protect. The military is left paralyzed by the disaster, and Akane faces renewed skepticism from her team, though she finds
emotional support in a budding friendship with Yuhara and his young daughter, Sara.When Godzilla resurfaces to attack Tokyo, the government is forced to deploy the modified Kiryu once more. The ensuing clash is brutal and destructive. Godzilla’s immense power severely damages Kiryu, disabling its remote-control systems. Driven by a fierce determination to protect her country and finally conquer her past trauma, Akane bravely enters Kiryu’s cockpit to pilot the machine manually from within.In the dramatic climax, Akane maneuvers Kiryu into a desperate grapple with Godzilla, dragging him into the ocean. She fires the Absolute Zero Cannon at point-blank range. While the freezing blast fails to kill Godzilla, it inflicts a massive, smoking wound on his chest. Exhausted and severely wounded, Godzilla retreats into the sea. Kiryu, heavily damaged but victorious, stands silent. Akane emerges from the cockpit, finally finding personal peace and earning the hard-won respect of her comrades.