This is a different world from Blue Star. In this world, there is a strange creature called the Holy Soul, which they are more familiar with as Mecha. Humans and mechas coexist and live together in this world. Although there was a lot of friction between the two sides at the beginning, as time goes by, they gradually get along and become interdependent.
However, if there is a beautiful world, there must be a dark side. One of the strongest humans in ancient times believed that humans and mechas could not coexist, and advocated the destruction of the existence of the Holy Soul, but was rejected. The human never gave up his idea. He used forbidden techniques to integrate his holy soul with himself, gaining powerful power. Then, he began to destroy the entire Kavanagh continent, taking the name of Darkness.
With the resistance of many holy souls and humans in Kavanagh continent, they finally succeeded in sealing the darkness. But the darkness never really leaves, and danger is always lurking. The people who wanted to destroy the Kavanagh continent gathered together. Although there were only seven people, they made the entire continent frightened. They were called the Seven Deadly Sins.
Their goal is to find the object that seals the darkness so that darkness can return to the world.
Audience grandpa [what]