There is such a kind of people - they wear black clothes and blend into the night; they hold sharp weapons and spend their entire lives without being able to shake off the sword's shadow; they have a pair of perfect hands that can only take a person's life in an instant, but they can never wash away the blood on their hands; their path has only two outcomes: kill or be killed. There are two women like this - they have been alone since childhood, but they have grown up under the care of killers; one of them likes to wear black clothes, and the other is dressed in white; they do not want to get involved in the chaotic world, but they are killers; they have excellent martial arts, but they can never settle the grudges of their lives. I just want to live happily and happily. Is the blood feud important? Does it matter if you are from a noble family or a heretic?