First things first is that this story ends on a massive fucking cliffhanger... yay so if you don't like that stay the away. But for those who are fans of devilman and mazinger and you don;t care much about story and just action then this mange is for you. The artwork is amazing detailed and visceral, its freaking amazing to read just to see the next action scenes. Again the story is a mess and if you are looking for good story then don't bother as for the most part its one note though the emotions for fights comes through enough that you can feel their anger since the story is pretty simple as well.
TL;DR Good action, if fans of Devilman and mazinger read meh story, cliffhanger