In the southwestern part of the Continent, Zemilia is the tiny kingdom of Liber, a small monarchy that managed to challenge all the chances against 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 they know, and calls them to register to become disciples in the guild of the vocal. 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. Of course, from there everything is not exactly as it seems.