In the southwestern part of Zemilly, Contenn is the tiny kingdom of Liber, a small monarchy that managed to challenge all attempts to overcome them during the war. Liberl is divided into five regions: Rolent, Bose, Ruan, Zeiss and Grancel. In the city of Rostern Cassius Bright brought up two sons alone, Estel and Joshua. He taught them everything that they know, and one day he calls them to register to become students in the vocal guild. Shortly thereafter, however, he receives a letter and must go on business, allowing Estel and Joshua to cope alone. When they work, one day they receive a notice that their father's plane disappeared. With this in mind, they are preparing and sent to find the ship and save their father.