Isekai Toushou no Maken Seisaku Gurashi

The katana smith Lutz has just forged his magnum opus, a katana so bewitchingly beautiful that it's dangerous even to look at. Unfortunately, as an unlicensed smith, he has no way to sell it. But when his only real business partner, Claudia, is captured by crooked knights, Lutz knows exactly what to do with his perfect blade.
On the other side of the city walls, Gerhard, an old enchanter, is facing a horrendous slump. Though he's confident in his abilities, he can't create a true work of art without a proper canvas, and he longs for nothing more than a unique sword to serve as his muse. This time for sure, he will create an enchanted sword that will wipe that damn disinterested look off of the so-called hero's face.
This is a tale of the gloriously deranged few who have given their lives and souls to crafting enchanted swords. When they come together, will they bring forth a golden age or the collapse of society itself? To those maniacs, it doesn't matter either way.
(Source: J-Novel Club)