When office slave Tadashi Tanaka dies of cancer, he finds himself reincarnated in a violent world resembling medieval Europe. Now living as Varian de Lioncourt, he must begin his life anew!

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.