Alright, so it all begins with a boy named Noah. Noah has a severe case of Apotemnophilia. He, after a long time of contemplating and at a young age decides to tell his parents that he wishes to permenantly alter his body. They react badly, become scared and confused, and repress him. He attempts to repress his feelings, but they grow harder to ignore and begin to drive him mad. He continues to repress this feeling until one day, when he was 22, he takes matters into his own hands and severs some minor appendages. He begins to experience bliss and euphoria like never before. As he continues his daily life, removing more and more of his fingers and toes, he notices the forms of other humans. He realises that he can't afford to completely destroy his own body and render himself useless, but he might be able to experience the same joy and pleasure if he "fixes" the bodies of others.
Then begins the kidnappings, mutilations, him keeping disfigured victims alive for as long as possible while he removes limbs and such. I haven't figured out much for the rest of the story as of now, but I will try to work on it as much as possible.