Kihara Mei is still living her ordinary life as a merchant in the capital as a humble citizen. She thinks her life will always be this way and nothing will ever change this. But she is wrong. One day, she has to face a deadly encounter with the dangerous assassin of the royal. From this point on, her life can never go back to be the same anymore. Since she has attracted the attention of the Blood King, her life will be filled with things that she never expects before, entangled in a world of betrayed, secrecy, and deceit.