The nine dragons have been fighting the demon dragons since the beginning of the world, and now they are stronger than ever, but they can't do much for themselves. They want to go back to the human villages, but the dragon who allowed the dragon to destroy their village is a useless brother fighting for ungrateful people. He should pay compensation to the people who let the dragon destroy his village. The sky dragon and the lake dragon are too slow and aloof from the outside world, so they blame the demon dragon for their slowness. The more they know about the dragon, the stronger it is for them, and the more they want to kill the dragon.