Ordinal Scale

In the third decade of the twenty-first century, the Earth began to be invaded by a parallel world named Unital. Unital opened dimensional gates in various cities on Earth to send in displaced biological weapons known as Displaced Biological Arms (DBAs), intending to launch a full scale attack once enough of them had been gathered. Having predicted the upcoming invasion, an international organisation known as «The Order» developed a dimensional tuning device, called the «D Tuner», to find the invisible Displaced Biological Arms and destroy them through the use of special «D-weapons» that were created for this goal. The Order then began recruiting Adapts, people compatible with these devices, from the civilian masses for a large-scale Earth defence operation. Adapts were tasked with using D Tuners to collect energy crystals known as «Materials» that were byproducts of Unital's dimensional gates, and destroy any Displaced Biological Arms lurking in town. Based on these contributions, Adapts are given a Ranking Number that determines the strength of their D-weapons. This Ranking System also allows Adapts to steal Materials from other Adapts, which resulted in conflict among the three factions of The Order, the leadership of which decided to employ a strategy of watchful waiting and not interfere in the internal conflicts.