ＧＡＯＧＡＯ！２ｎｄ ~パンドラの森~

A biological experiment that began in 1993 led to a terrible disaster in the beginning of 21st century. A virus that turned living beings into mutants and monsters has been unleashed. Soon the Earth turned into a terrifying place of chaos, as more and more human beings became infected. Unspeakable violence obliterated human civilization. Within a few years, humanity was on the verge of total annihilation. The Era of Darkness began.

But not all hope was lost. Humans began building cities known as "Domes", isolated from the wilderness, protected by glass from all sides, cut from natural resources. It was possible to start building civilization anew.