An ancient species claiming to be setra people has the ability to talk to the stars. About two thousand years ago (the game began), setra's ancestors heard the plaintive cry of the planet and found that the planet was hit by a disaster from the sky, causing huge wounds. The planet healed the impact, saying that all vitality was transformed into healing energy. In order to prevent the life energy necessary for the planet from being cut off, setra people who learned that the planet was injured desperately raised the land, but in the end they could not avoid the rapid drying up of the land and eventually needed to leave their residence. But when they are ready to leave and embark on a journey, they see all kinds of visions, which are caused by people who hurt the planet, that is, disasters fall from the sky? Genover.
Genove pretended to be a relative of setra and approached people in setra, and then began to spread the virus to them, turning these people in setra into monsters one by one. In the end, only one person in setra survived, and that is Aerith's mother, luna according to law. She survived and met Dr. Gaster in Iceberg Village. Together, they studied the knowledge about planets and ancient species. Shen Luo's scientist Bao Tiao found them living in seclusion here, so she took luna and Ai Ruidai, who were born only 20 days ago, and killed Dr. Gaster.
According to the law, luna was studied by Dr. Bao Tiao for seven years. However, due to the negligence of Shenluo Company, according to the law, luna used his only magic and tried his best to escape from this place with his daughter. Later, he went to the slum station, entrusted his daughter Aerith to a woman, and then he died in a hurry. Over time, the only ancient species in the world? Aerith also grew up, then met Claude and others, and took many adventures.