A boy killed by his superhero idol, then he decided to become a Dark Walker. "Saving the world by destroying the world"
3 Volumes (Ongoing)

As of volume 1:
Two strongest points of this manga are the setting and the art. Unfortunately, instead exploring this beautifully drawn near-future world and the characters place in it, the author slides into a generic shounen action romp, spending most of the volume on bland, unearned fight sequences. We barely spent any time with the MC, know very little of the world, its inhabitants, their abilities, so all the fighting feels hollow.
Most of the characters present are empty caricatures of extremist thought, spouting on about exterminating opposition and their faction supremacy. All are unpleasant and easily forgettable.
Maybe it'll improve as it goes on, but the first volume was a disappointment.