Cardfight!! Vanguard. A card game that garnered millions of players to play the game, either for fun or competitively. Sometimes, it's just for the waifus and husbandos. Anyway, this book tells the story of a boy named Hiyoku Kagure, who, alongside three other students, and his twin sister, transferred into the Touken Ranbu All-School, and his development on the game called 'Cardfight!! Vanguard'.