This is the story of the hatred between two sisters in Tokyo in the year 20XX.
Aya grew up as an only child with her father, who gave her a strict training in the art of the sword. But now he has been killed and she is seeking revenge. Saki was brought up an only child by her mother, but saw her die of illness and poverty and swore vengeance on the father who abandoned them to follow the way of the sword. Saki then discovered an ancient art to bring her mother back to life, but to do this, she must have the heart of her half-sister Aya...
In a tumult of love, hate and rage the battle between the sisters has commenced. Progress through the game as you literally cut an army of undead to pieces!