Aideen, the daughter of a Duke and leader of the assassination troupe "Owl", is betrayed by her master Raymond and executed for crimes that she didn't commit. However, when her life seemingly reaches its end, she somehow travels back in time five years. Learning the truth about her father’s death, Aideen vows to eliminate the Empire of Perdi and take her revenge against its Emperor. Sent to the enemy kingdom of Jeldion, Aideen is tasked with negotiating peace, but she has yet to realize that fate has unimaginable things in store for her...!