This is a time-travel novel about card duels. The protagonist is a card master who accidentally travels to a world centered on card duels. In this world, humans live in a corner, monsters are rampant, and it is full of unknown dangers. The protagonist uses his skills to survive and rise but faces complex threats and conspiracies.
To find a way home, he embarks on an adventure, meeting partners and powerful opponents. Through life-and-death duels, he grows and uncovers the world's hidden secrets.