This is the kingdom of Rui. It is a land envied by the whole world for its abundant resources and its ability to sustain all forms of life. Because of this, the kingdom has lived under constant threat from the Demon Queen Luna, suffering through plunder and the theft of its resources. Now, she has begun her final move to seize Rui itself, and you have stepped forward to stop her.

After finding a magic stone that granted her the ability to use magic, Guest grew stronger by defeating the monsters summoned by the Demon Queen. Finally, she has arrived before the gates of the Demon Queen's castle.