Bargained

Spirits of the dead eventually rise right? But there are some that fall onto the earth stuck, knowing that they were the not enough, instead they have to Bargain other living souls like Reiji and serve them until there duty is done and then go back to heaven or the right full place of paradise. They are normally called SINS but they are split into two parts. One is called the WITHERS with evil intentions and the OTHERS with a second chance to prove that they are worthy enough. these SINS are usually are called demons to humans because of their powers although there are only about 20 living/roaming around the world. There are other humans that summon SINS to make a contract to give up their soul if they have evil intentions. But there are ones that have some kind of hate to summon them and they usually make a bargain.