Different World Slow Life Begun at the Smith 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

One night, Eizo, a hapless corporate slave, saves a cat and gets hit by a truck. The cat which seems to be related to a parallel world, in return for his help, grants Eizo a skill of his wish and reincarnates him to another world. Eizo, who has craftsmanship as a hobby and wishes to use this skill for a living, chooses to be reincarnated as a blacksmith. And so he starts his life in another world as a blacksmith just as he wishes. However, Eizo's creations are at another different level that will shake this new world.