Living a secluded life in Belgium, Sei has no thoughts of returning to her former life as an assassin until a mysterious person confronts her with a contract she can't possibly turn down. Payment isn't monetary; instead, it's information leading to the whereabouts of a little girl. Hers.In a matter of seconds, Sei is pulled back into a world she left behind. She accepts the contract to chase the truth about her daughter, but what appears to be a routine...