A show about a girl, named Saya(you pronounce it sie-ya) who kills, slices, and dices people with her sword.
But when she loses her memory of the past she has lost the ability to bring pure terror upon any people.
Creatures called Kyropterin (they call them mice) feed on human blood, or animal blood if desperate.
Only Saya has the blood to turn the mice into stone.
The sword is unique, has a blade at the base where Saya cuts her hand with and her blood travels through the whole sword.
A crazy girls who kills anyone she wants to, with a sword!
Movie is called Blood +, look it up on youtube.