In 1899, the earth was invaded by a group of alien creatures of unknown origin. Humanity had to unite to protect the safety of the earth. However, humans were too weak. Half of the earth was invaded in just one month. The number of humans was already very small, but the number of animals was increasing rapidly. The myth says: A living thing can be transformed into a human form after thousands of years of cultivation. The name is: Demon. In 1900, Dr. Morrigan Kaman discovered the "mutantin" and published a report on it. He said: The legend is true. Every animal has its lifespan. As long as they safely pass this lifespan, they can begin to cultivate themselves as humans. But the vast majority of animals around the world never make it through their lifetimes. And "mutantin" is what helps them get through those days or two. "By the way, you have a chameleon, don't you? Think about it, after the animals turn into human bodies, they will combine their characteristics with human characteristics. Isn't it perfect?" "What do you want?" "Great animal trainer, as long as you dedicate your animal corps, I will make them the most dazzling team on the equatorial battlefield."