Near-future Japan. Five ordinary girls have been chosen by an organization that tracks intrusions from "Phantoms"—digital entities crossing from cyberspace into physical reality. Each girl is equipped with advanced transformation technology that lets her fight these anomalies as a Trinary. Between missions, the five navigate their own complicated private lives—secrets they have not shared, struggles that have nothing to do with the digital war. A game about what it costs to be chosen for something you did not ask for.