Isekai Toushou No Maken Seisaku Gurashi summary:

Lutz, an unknown blacksmith, one day forged the greatest sword of his life. However, due to a certain incident, he was forced to part with that sword. He did not engrave a signature on the sword, nor could he prove that he was the one who forged it.Nevertheless, the sword he forged emanated a beauty and ferocity that shook the hearts of those who witnessed it. As the sword traveled from person to person, it eventually led to an encounter that would greatly change Lutz's destiny.A blacksmith fantasy where an unknown blacksmith and an unsigned sword shake the hearts and fates of people!!