Godzilla: The Planet Eater

Godzilla Earth has become a monster's planet, with the largest Godzilla standing 300 meters tall. Captain Haruo, a human protagonist, aims to defeat Godzilla and reclaim the planet for his people. 20,000 years have passed since humans fled Earth, and the planet's ecosystem now revolves around Godzilla. Haruo teams up with the Houtua tribe, who lead him to the remains of Mecha-Godzilla, a potential anti-Godzilla weapon.