Neo Kyoto is a society where every matter is settled through the card game "Build Divide." Whether resolving personal disputes or establishing social standing, triumph in Build Divide equates to success in life. Every player's ultimate goal is to become the King, whose unmatched abilities grant them near-absolute control over the city. One day, a young man awakens in Neo Kyoto, retaining only his name, Teruto Kurabe, and possessing a deck for a card game he no longer recognizes. Teruto soon meets another player, Sakura Banka, who assists him in recalling both the rules of Build Divide and his initial objective: he must meet the King, regardless of the circumstances. Joining forces, Teruto and Sakura determine that their most viable path to a royal audience is the Rebuild tournament, where a competitor who gathers twenty-one tokens from opponents earns the right to challenge the King for the throne. Yet, as Teruto continues to play, he starts to recover his lost memories, which cast doubt on the true nature of Neo Kyoto.