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.