Have searched for this manga but can't recall the name of it. Premises is of huge Angels raising special human children inside a cathedral of sorts. The main character finally attempts to enter the outside world where they find out that Angels torment the rest of the humans into a workforce. Later on as the children "graduate" it's discovered that the Angels are using these children to reincarnate their lost Angel warriors lost in the fight against demons. A girl who has absorb the essence of a shadow demon I believe comes to save the main character and then he absorbs an Angel's powers. Epic fight scenes ensue and the story left off with him and the girl seeking a way to remove the core of the Angel from another girl. That's all I can recall of the manga and any help in finding it would be greatly appreciated.

Godspeed

Totally forgot to add this to my list

Thank you, feel like an idiot now because I actually viewed that during my search briefly.