At least he just starts out by saying he can't make a watch. A lot of these feudal society iseaki stories are underpinned by our "totally average, unremarkable MC" being all like "well, I was just a corporate office drone, but I watched a youtube video once about how to assemble a cold fusion reactor so I can share that technology with you now by building it out of sticks, bear skins, and this roll of duct tape I had in my pocket when I was transported here."