The Kingdoms of Ruin manga volume 1 features story and art by yoruhashi.

For ages, humanity flourished through the power of magic, a gift from Witches to aid mankind. But times have changed. The scientific Gear Expansion has made both magic and witches obsolete. In order to liberate humanity from the blight of magic, the mighty Redia Empire began a ruthless hunt to exterminate all witches. Adonis was only a boy when the hunt began, apprentice to a witch he dearly loved. When she perishes at the hands of the empire, Adonis vows revenge. By this furious wizard’s power, blood will flow!