Teppei is going to visit his older brother Kotaro Takamiya during a scientific conference after training with a mysterious woman named Karen for the past 11 years. However his plans for a family reunion become stalled when a woman named Aramis kills everyone in the conference to kidnap Kotaro. Teppei on the way to save his brother encounters a broken mechanical horse called B't X who revives thanks to Teppei's blood and is now his aide to save his brother from the mysterious Machine Empire.

In the future, human beings are attacked by beings called the Bug-chine, which appeared a few years back. No normal human weapon can defeat the Bug-chine, but there is hope. It is the AMDrivers that will save the earth. They are solders using the latest "AM Technology". With overwhelming power, they will beat the Bug-chine one after another and become heroes, as well as capture the hearts of their fans. (Source: ANN)