Metalial Story is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Metalia, a world where mechanical creatures called the gears stroll. It was the so-called "machine hunters (collectors)" who hunted those who ruled the earth with mighty power. A boy now descends in Melzam, the largest city in Metaria. His name is Nill. He, with the right arm of the machine, had a secret. This is a story that looks for your fate.