After a chance meeting with a salesman on his way home, Yuuji brings back an intriguing board game and decides to try it out. Setting up the pieces alone at first, he soon notices something unusual as the rules begin to take effect. The game exerts an unseen influence, drawing in others and guiding their choices in ways that stray from their ordinary habits. This first episode follows the early stages of play as the mysterious compulsion starts to shape events.