(Mainly card battles, with a slice-of-life feel, character growth, and adventure. The card game is entirely fictional. The main reason I wrote this book is that I came up with a new set of rules unlike traditional card games such as Yu-Gi-Oh! and Hearthstone, and wanted to indulge my love of card battles.) In that world, there is a fantastical game. The game is like a set of rules governing the world: ordinary cards appear naturally in random places, everyone is born with a character card of their own, and everyone instinctively understands the rules. Two players face off, using sets of cards on their own or their opponent's character cards to defeat the opposing character and win. After a meteorite falls, the protagonist, Ouyang Tao, goes along with the crowd to see it. For certain reasons, Ouyang Tao eventually leaves, and somehow a sacred card perfectly suited to her character card appears in her hand, bringing a whole new color to her card-playing life. Determined to grow stronger, Ouyang Tao and her companions eventually set out to explore.