In a world where you are separated from your parents as soon as you're born and raised in shared houses until you're 18, and then you're given pills that are supposed to make you vomit. And whatever colour it is dictates where you belong.
Red - Reuben, the brave, intelligent and creative. They often lead military lives or go to run successful businesses. They also often become police officers and teachers if they want a normal life. They often strive to obey the law and they don't often find themselves breaking it.
Blue - caeruleum, the caring, kind, witty and artistic. They often go on to be nurses/carers or artists.
Yellow - ater, the sly, courageous, manipulative and controlling. They're either petty theives or average workers. A life of crime or a life of boredom.
Colourless - reject, they do all the key jobs: cleaners, bus and train drivers, etc. Not much is known about them.
Follow the lives of a delinquent Reuben, a heartless Caeruleum and a caring Ater.
The only mistakes.
Waking up in the body of a Romani Archiman is acceptable. Getting 3rd and 1st True Magics is nice. Getting Beasts as pets - delightful. The world of DxD is unforgivable. It's a world where some teenagers who aren't even two decades old somehow mystically defeat the descendants of legendary heroes, ancient demons, powerful dragons, etc. Why does this happen? Simply because! Simply put, this world only makes sense because it doesn't. And now, I have to put up with the fact that I live here. Such pain. (DxDxMulti)