The Giselia Empire. A coup d'etat took place 15 years ago, and the king was replaced. The current king, Vallon, has imposed heavy taxes on the people. The strength of the imperial army is the best, and the security of the country itself is good. The people were suffering from heavy taxes, but not many of them were complaining. Rietta Fane is a young girl who lives as an adventurer in the Giselia Empire. She has been raised by Negel, her sword master, since she can remember, and she has never known her parents. While living as an adventurer, Rietta was searching for the person who killed Negel. One day, Rietta receives a request to escort a nobleman at the guild. However, on the way there, she is attacked by someone .......