Maya Chrysalle joined Mariterra Agency Office with a fake identity of Anya Gillphia and even a fake appearance, in the hope of finding a safe place to work and live. But Anya soon discovered that she does not do normal work in Mariterra Agency Office, but instead, she had to going out for missions to solve cases related to both merpeople and human. She also had to deal with an unpleasant work partner, Lucas Pelantio. After a while of working, Anya realised not only herself had secrets she didn't want others to know, but other members might also had things about them that were hidden away from her. Can Anya cope with the work in Mariterra Agency and maintain the job successfully? Will she get along with Lucas and be partners permanently? Would she be discovered with her secret identity or find out the secrets that others have hidden?