Lutz, a skilled but unlicensed katana smith, relinquishes his proudest work to save a friend. When it leaves his hand, it marks a turning point in his life and the future of the world. This is a tale of the deranged few who call themselves craftsmen.

After sacrificing himself to save a cat, middle-aged salaryman Eizo is offered a second life as a blacksmith in another world. With his overpowered smithing skills, Eizo forges weapons that are superior to anything his new world has ever seen!

After saving an injured cat, middle-aged, overworked programmer Eizo is rewarded with a quiet life as a blacksmith in another world. His newfound skills turn out to be god-tier, and the weapons he makes are strong enough to turn the tides of war.