"Godzilla: Planet of the Monsters" is a 2017 anime film that serves as the first installment in a trilogy. Set in the future, humanity faces extinction due to the emergence of massive creatures, primarily Godzilla, which dominate the Earth. After decades of conflict, humans abandon the planet in 2048, fleeing to space in search of a new home. However, their efforts to colonize other planets fail, leaving them stranded and desperate. Twenty years later, the surviving humans, now led by a council of alien races they encountered in space, decide to return to Earth to reclaim it from Godzilla.

The story centers on Haruo Sakaki, a young human soldier driven by a deep-seated hatred for Godzilla, who killed his parents during the initial exodus. Haruo spearheads the mission to retake Earth, proposing a risky plan to defeat Godzilla using advanced technology and strategic warfare. Upon returning, the humans discover that 20,000 years have passed on Earth due to time dilation, and the planet has transformed into a hostile, alien environment dominated by Godzilla and other monstrous creatures.

The human-alien alliance deploys a multi-pronged attack, utilizing mechs, drones, and EMP weapons to weaken Godzilla. Despite their efforts, Godzilla proves nearly invincible, adapting to their tactics and overwhelming their forces. Haruo and his team uncover a new species of humanoid creatures called the Houtua, who have evolved on Earth in humanity's absence. The Houtua possess a mysterious connection to Godzilla and hint at a deeper, ancient conflict involving the creature.

As the battle intensifies, Haruo's obsession with destroying Godzilla leads to reckless decisions, endangering his allies. The film explores themes of survival, vengeance, and humanity's place in a world ruled by forces beyond their control. The narrative sets the stage for the subsequent films in the trilogy, leaving key questions unanswered and tensions unresolved. The film's focus on Haruo's internal struggle and the broader existential threat posed by Godzilla creates a tense, action-driven storyline with a strong sci-fi foundation.