Shimizu Ace, age 17, is a prodigy making waves in the Trading Card Game scene. At school and his part-time job, he's unassuming, he doesn't have many other skills, but in competition he's dominant. However, without even being able to win a major tournament, he dies in a stabbing. He wakes up, and an old man tells him that he'll be able to keep living in another world.

Then he appears in the hall of a castle, where a king asks to see his Skills. But when the Skills appear, they're all based on trading card!? With nothing but skills like that, the king banishes Ace from the castle, forcing him to find his own way in a brand new world! Ace walks around the city, unsure of what to do, but then...