The devil's guardian

This story is based on a human boy, rather weak, with no cheat whatsoever, who will become one of the commander of the devil's army and will battle the humans, having to achieve a totally impossible mission. This story includes some scenes that could be shoking to some readers like wars, murder and much more, so please think before reading.
This story will be cut in multiples parts, an introduction part and some development parts with more than 100 chapters in total (on what I have planned).
It's a very open story with magic so every comment counts and I will do my best to make it happen, it will be uploaded one or twice a week depending on my schedule.
Apart from all of that, I wish to all of you a good time reading my story.