Story:
Rin is a normal 1st year high school student. She is an orphan who has been raised by the local shrine. What she doesn't know is that her parents were murdered because they stole a powerful artifact that gives one the ability to summon and control demons. Unbeknownst to Rin is that her mother, when she was giving birth to Rin, transferred the artifact into a small worm that crawled inside Rins mouth when she cried for the first time giving her hidden powers that she doesnt know are there. Because the artifact is now a part of Rin forever, the people who her parents betrayed are coming for her.
If you guys like this premise, I have a lot more ideas for characters and story development. I wanted to stop here because i want your opinions before i put more time into this idea.