In the bustling streets above Tokyo's hidden depths, an ancient underground society begins to stir after decades of quiet, targeting the micos whose unique powers could revive a forgotten god. Government agents receive urgent orders to track down and secure these individuals before the society can claim them. As the first moves unfold in this shadowy conflict, questions surface about the society's true goals and the micos' mysterious origins. The agents race against time to shield their charges from an awakening threat that could reshape the city.