Card Game de Sekai ga Horobu Sekai ni Tensei Shite Card Shop wo Kaiten Shitara, Shuui kara Zensaku Shujinkou da to Omowareteiru

In a reality where card games dictate the very fabric of society, it is practically expected that the fate of the entire world will hinge on the outcome of a single duel. Mitsuru Tanefuda finds himself reincarnated into exactly this kind of universe—a place obsessed with trading cards to an almost absurd degree. Rather than stepping onto the battlefield to save humanity, however, he pursues his lifelong dream and opens his own card shop. His only wish is to stand behind the counter and watch the people of this vibrant world experience the thrill and joy of dueling up close. Yet, running a quiet retail business proves far more complicated than anticipated. For reasons entirely beyond his comprehension, the locals have collectively mistaken him for a legendary hero from a previous era. They revere him as a seasoned savior who once resolved catastrophic, world-ending crises and now watches over the next generation of duelists like a noble predecessor. The comical truth is far less glamorous: Mitsuru has never thwarted a global disaster or participated in any earth-shattering incidents. Despite his completely ordinary nature, he must now navigate daily life as a humble shopkeeper while desperately trying to manage the impossible expectations of a world convinced he is its greatest champion.