In 2177, due to human's wanton destruction of ecology and endless abuse and waste. And the endless flames of struggle. As a result, human civilization suddenly suffered the gift of destruction from nature. Ecology and human civilization have been reshuffled. Human civilization for thousands of years has been destroyed without leaving a trace. After mankind suffered this disaster,
Humanity has re-established its own civilization, fought between countries, and explored unknown and unexplored continents to understand the previous civilization of mankind. The cause of the disaster was eventually discovered.
