Long, long ago, there was no difference between heaven and the human world. Every corner was filled with happiness, until one day something unexpected happened. The archangel Lucifer fell in love with a girl. However this girl was already in love with another angel. Jealousy consumed Lucifer until he lost his mind and used his powers to transmute the girl into dew and the angel into starlight in order to separate the two lovers forever.
Lucifer knew he would be punished sooner or later, so he gathered a rebellious army and attempted to overthrow the reign of God. Afterwards, Lucifer and his rebel army failed and were expelled to Hell. Ever since Lucifer was expelled to hell, he has been planning his revenge. He is expanding his evil forces now, and has founded a demon-training camp, with the purpose being to destroy the Garden of Eden. Even worse, Lucifer believes now is the right time to take his revenge on God.