In a world where it’s common for card games to bring about the end of the world, I, Tanafuda Mitsuru, who was reincarnated into such a place, finally achieved my dream of becoming a card shop owner. In this world, where people seem to enjoy card battles more than anything, I simply wanted to watch them up close and share in that joy. However, for some reason, everyone around me sees me as some kind of former protagonist—a veteran who once resolved a great incident and now watches over the next generation of duelists. When in truth, I’ve never solved anything remotely close to a major incident. This is the story of a reincarnator who, after becoming a card shop owner in a world where card games take precedence over everything, is somehow mistaken by everyone as someone who must have once saved the world.