A Soulless Spirit: A Deal With Death

Aiden Karya is a lonely teenage loser. One day while trying to protect his sister and her friends from his local highschool bullies, he dies...
As a ghost, Karya struggles to find a place among the dead. When Death comes to take his soul, Death notices that he cannot take his soul...
And the reason why? It turns out Karya's soul was stolen when he died!
So Death makes a deal with Aiden. If he can help Death capture all the 7 demons that escaped Hell, he will bring him back to life.
But there is only one problem... Karya's spirit will fade away without a soul. And the only way to keep that from happening is to devour human souls...
Will Karya accept the deal? Or will he suffer as a Souless Spirit...?
More importantly, will Karya choose to eat human souls, or fade away?