It Takes More Than Just The Soul

Mini Chapter: The History of Our Lady Angel of Saving Graces

          Eight hundred years ago Asura defected from the legendary Eight Shinigami Legions. He was the strongest of Death's guardians, but he feared everything, even the ones who cared about him deeply. Fear consumed Asura and he developed a hunger that only the devouring of human souls could satisfy. No soul was safe, including that of his own Demon Weapon partner, Vajra.
Once he had succeeded in becoming a Kishin there was no going back. Shingami and Asura fought to the death and Asura met a gruesome end. Being the true first of his kind, Death and the remaining members of his Legion were unsure how to permanently destroy him. Death was pushed to his brink and decided that the most suitable punishment was isolation in the worst prison currently imaginable: Asura's own skin.
Death, to the objection of his wife, Angel, skinned Asura alive and used it as a sealed bag- to keep him and his madness locked away from the world. The process was so extremely straining and powerful that it anchored Death's soul to the location he performed the punishment. That spot would later develop into Death City, one of the most influential locations on Earth.

Most of the Human settlers who witnessed the battle revered Death for the awesome display of power and saving them from the Kishin's hunger. Death's new following of loyal supporters built up around him. They felt safe in the Reaper's presence and despite his eccentric personality considered him incredibly wise and brave.
As the small village grew into a town the supporters grew more and more accustomed to the peaceful life of living safely within the boundaries of Death's soul, unfortunately, this came with a price. The safer they believed their home was the more dangerous and evil they perceived the outside to be, the more dangerous and evil adversaries, strangers, and outcasts appeared.
What those early villagers feared the most was the rising of another Kishin like Asura.

As the small Death Village grew into a small Death Town the citizens grew increasingly suspicious of the newcomers. Most were not like them, they were Demon Weapons, escaping persecution in Europe. The humans were unsure of how to trust Demon Weapons due to the way they came about and how they knew becoming a Weapon was the first step to turning into a Kishin.

The townspeople regularly shunned, harassed, and attacked Demon Weapons and other non-human individuals. Death, at first, did nothing about this. He was still recovering and he and the rest of his team members were still figuring out how they would continue their self-appointed positions.
Angel, besides being Death's wife and Guardian Angel, was one of his remaining team members. She became very emotional after Asura's sentence and was ashamed that they didn't do more to prevent the tragedy from happening. Not wanting any event like this to occur ever again she encouraged Death to stop his followers from behaving so horribly and to openly welcome the Demon Weapons attempting to escape persecution in the Eastern hemisphere.
Angel, compared to her Reaper and the other Shinigami Guardians, was the most empathetic, sympathetic, compassionate, and merciful. From her perspective, the Demon Weapons didn't do anything to deserve widespread oppression or any lesser treatment at all. It was Arachne's fault. It was Arachne's fault that the Grand Witch declared war on Death and his followers, too. (But even then she couldn't help but feel that not all the blame should be placed on the spider Witch, either.)
She knew that her husband and Eibon were secretly working with the Witch in hopes of creating beings like the Demon Weapons, but not even they knew she was killing her own kind and collecting other innocent souls to do so until it was too late.
After being very persistent Angel was able to convince Death and the remaining members to openly welcome Demon Weapons to the town, and promise to protect them. This, of course, did not go over well with most of Death's followers at that time.