It is the dark century and the people are suffering under the rule of the devils known as Vandals, who are able to manipulate monsters. The Vandal Busters are a group of people who hunt these devils and among them, the Zenon Squad is known to be the strongest on the continent. A young boy, Beet, dreams of joining the Zenon Squad. However one day due to a mistake Beet makes, the Zenon squad was defeated by the devil Beltose. The five dying busters passed their life energy into their five weapons, their Saiga. After giving their weapons to Beet, they passed away. Years have passed since then and the young Vandal Buster Beet begins his adventure to carry out the Zenon Squad’s legacy, and put an end to the dark century.