Sonata or Siren?

I found her just lying there, In the rain and covered in dirt. I couldn't just leave her there, I couldn't.

I found her just lying there, In the rain and covered in dirt. I couldn't just leave her there, I couldn't. With all my strength I carried her to my house and laid her down. If I just let her freeze to death, I wouldn't be able to live with myself. I swear I've seen her before, the blue hair and the strange necklace.