Team Q4 disbands after their grueling national tournament battle, returning to their ordinary lives. During a visit to Card Capital, Aichi Sendou notices an unfamiliar customer and introduces him to the world of Cardfight Vanguard. To his surprise, Aichi's deck has transformed significantly since their last meeting, featuring units he's never seen before. Despite everyone insisting that these are the same old cards, the mysterious boy vanishes without a trace, leaving Aichi baffled. As he adapts to his peculiar new deck, Aichi sets out to uncover the truth about the incident and the enigmatic stranger.