"Babel II" is a science fiction anime series that revolves around Koichi, a high school student who discovers he is the reincarnation of an ancient alien entity known as Babel. This revelation comes to light when Koichi begins to exhibit extraordinary psychic abilities, including telekinesis and telepathy. His powers attract the attention of various factions, including a secret organization seeking to exploit his abilities for their own purposes.

Koichi is not alone in his journey; he is accompanied by three powerful guardians, each representing a different element of nature. Rodo, a massive rock-like creature, embodies strength and durability. Poseidon, a serpentine water entity, commands the seas and aquatic environments. Roscoe, a bird-like being, dominates the skies with its agility and speed. These guardians are fiercely loyal to Koichi and aid him in battles against formidable adversaries.

The central conflict arises when Koichi learns of his destiny to protect Earth from an impending alien invasion. The invaders, known as the Mikado, are a malevolent race that once ruled the planet and now seek to reclaim it. Koichi must harness his newfound powers and unite with his guardians to thwart the Mikado's plans. Along the way, he faces numerous challenges, including internal struggles with his identity and the moral implications of wielding such immense power.

The narrative explores themes of destiny, responsibility, and the clash between humanity and extraterrestrial forces. Koichi's journey is marked by intense battles, strategic alliances, and moments of introspection as he grapples with his role as Earth's protector. The series balances action-packed sequences with character development, providing a comprehensive look at Koichi's evolution from an ordinary teenager to a pivotal figure in the fight for humanity's survival.

"Babel II" is a classic example of the mecha and supernatural genres, blending elements of science fiction and fantasy to create a compelling story. The series' intricate plot, dynamic characters, and high-stakes conflicts make it a notable entry in the anime landscape.