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High-concept Sci-Fi adventure about an island that actually is a computer called Kyron 5, itself created to design and manufacture super-advanced robots to be used as slaves for the rest of the world. One day Kyron decides that human beings are unnecessary, so it declares war on the world. But Kyron cannot be tamed, and after many lives are lost in the attempt, mankind decides to leave Kyron to its own devices.

Searching for his brother, Ryota stows away on a boat belonging to a criminal alongside two other teenagers. The group shipwrecks on Letchi island and discover the Infant Island natives have been enslaved by a terrorist organization controlling a crustacean monster. Finding a sleeping Godzilla, they decide to awaken him to defeat the terrorists and liberate the natives.

Gaira, a humanoid sea beast spawned from the discarded cells of Frankenstein's monster, attacks the shores of Tokyo. While the Japanese military prepares to take action, Gaira's Gargantua brother, Sanda, descends from the mountains to defend his kin. A battle between good and evil ensues, leaving brothers divided and a city in ruins.