Amidst a global war, a group of small nations unleashed DNA-destroying bombs, halting all life on Earth. Before the bombs were deployed, humanity had preserved artificial copies of Earth's organic matter deep underground. They also created a system called " Mathers " capable of creating artificial organisms, and stored information about all living things in the genes of the newborn Buuk and Fal. Furthermore, they dealt with the situation by sending the two to a space colony and having them stay there until they needed the information. After some time had passed since all life on Earth ceased, and with only one year left until Buek and Fal were to land on Earth, Mathers suddenly issued an order to eliminate them. The colony was destroyed, but at the last moment, the two managed to escape in their respective escape pods and descend to Earth.