Useless Wizard 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

In Fortelnia, a world where strength and destiny are all determined by the rank of “existence power” a power that people born with. Aruto, who has only the lowest rank of existence [☆1], is so powerless that his girlfriend Hanna is killed by Gamizin, the world’s most powerful mage. However, Aruto, who has lived with regret in his heart, gets a chance to start his life over after death–? Making full use of his “crafting skills,” a special power given to him by God, he sets out on his second life to save Hannah’s life!