Why the damn hell am I me?

Sakura Nagashima is a student at Shiko Academy. She is unpopular, alone and slightly sadistic. And for some strange unknown reason, the demons have a strange unknown attraction towards this weird loner. For something even stranger, she doesn't seem to realise she's a fallen angel. For the weirdest thing, Sakura doesn't believe in mythical creatures. So when she finds out, what will happen?

Did I mention, YOU! ARE! SAKURA!

Also, what's her past with Mage and Shiki?
I don't own this and it might not be very good. Read at your own risk.