After their parents' tragic death, Thor and Rai Klein, twin 11-year olds, are banished from their birthplace. They wake up on the terraformed planet, Chimaera, where carnivorous plants thrive and humans are segregated into four groups known as "Rings." Here, they meet Zagi, a young man who informs them that only the powerful "Jyu Oh Sei" can escape the planet. Desperate to uncover the mystery behind their parents' demise and return to their homeland, Thor decides to survive the harsh and unforgiving Chimaera environment. However, he soon discovers that there's more to this deadly ecosystem than he had anticipated, as he becomes entangled in the intricate politics of the Rings. With unwavering determination, Thor unravels the truth behind his parents' murder and the fate of humanity.