A opportunity of a lifetime

Douma is a demon with no emotion. He never had emotion. Douma loves to tease Akaza about anything he can. He doesnt mean to hurt him in any way just some fun. Douma soon realized all his friends hate him wouldnt care if he were gone. If it weren't for the number in his eye.. he would of gotten killed by his own kind. Soon that will all change he meets a 'girl' short hair with a mask. She offered him a one in a life time opportunity he had to take. What was that opportunity? Hehe not telling you thats why you need to read this hehehe..