Sosaku Kamifuda, a dedicated card gamer, has spent his entire life immersed in his passion, even as his friends moved on to new life stages. At 30 years old, he’s still living his best otaku life—until his mother sells off his beloved card collection. Before he can even process the loss, he’s suddenly transported to another world! Lost and confused, Sosaku soon discovers he has gained a unique ability: the power to turn monsters into cards and summon them at will. When he rescues two young girls from a monster attack using his newfound skill, his journey as an isekai card master begins! Armed with his gamer instincts and strategic mind, this "old man" card gamer sets out to conquer the new world—one summon at a time!