——What would you define as a nightingale? ——Probably a miserable bird that is imprisoned in a cage and sings to the one she loves forever. ——Then what is your wish? ... So, it is probably a story similar to this. The main character is a siren girl. The same series of Western Fantasy Continent: "Free Alicia", "The Mermaid's Rules of Survival", "The Princess, the Brave and the Dragon", check the ball for details