Death Song 

The main character is a woman named Soran. Her only parent, father, passed away when she was only ten years old. Her uncle became her legal guardian. And then her uncle left her in a nunnery. Then her uncle passed away years later. At that time, she was given two choices of life time. One was to become a sister for rest of her life. The other was that she can get married to a man. She would have no choice in which man. She just had to be married...