The story begins with a conflict between ZET and ALPHAS, two opposing forces. As we delve deeper into the narrative, we learn about their pasts - Jin Kanzaki, a talented youth who can transform into the superhuman ZET and Kouga Amagi, a young man who possesses a strong sense of justice and engages in combat as ALPHAS, utilizing advanced technology. Their fates, as well as those of the people around them, become intertwined as they strive to safeguard humanity and eradicate the monstrous Players. It is ironic that the Amagi Corporation, founded by Kouga's grandfather, Mitsugai Amagi, produces these abominations.