The protagonist, Cecily, a royal knight, is on an exploration mission to the open seas at the command of the king, together with her lover, the alchemist Ray. However, during the journey, their ship is attacked by a monster and the two are washed ashore on an island inhabited by criminals. In place of her fiance, who is unable to move due to an injury to his leg, Cecily struggles to escape the island. However, the evil clutches of the criminals who are after her are closing