I Am a Doomsday Merchant, Selling Nuclear Bombs to the Brave

In my eyes, the priceless "healing potion" in another world is not as good as a box of expired antibiotics in the apocalypse. The "meteorite technique" that the magister chanted for a long time was not as powerful as a decommissioned rocket launcher that I exchanged for scrap metal. My shop, which looks chaotic, is actually a museum of dangerous goods from two worlds!