Sena is a spunky 16 year old assassin of Strylis. Everywhere she goes, people look down on her as though she was of lower class or a slave. Sena is not human, and will never be accepted as one. Being part of XOLA an organization that protects Strylis, Sena has hard times dealing with the ridicules from its people about her odd hair color and eyes. But everything changes when she is assigned to kill another assassin who was hired to murder the princess of Strylis on the night of her coming of age ceremony.