The catastrophe "Crescent Tears" was caused by the poisonous rain "Blue Cyst" that can kill people after bathing. More than 100 years later, humans finally began to overcome this disaster. In the village "Nest" in the deserted world, the people who lived tenaciously found the figure of the humanoid "Megas" equipped with a dual-thinking AI. The time is 2242 AD. Megas, who lost his memory and fell asleep, ushered in the moment of awakening--