Regolith City, a lunar city where brain computer interfaces have become commonplace. Detective 'Sid Blake' infiltrates a private presentation by Kaintech, only to witness the company's new android, 'Primer,' slaughter every attendee. Only Sid and a girl named 'Rin' survive. Avoiding Kaintech, which is attempting to cover up the incident, the two set out to track down the mysterious android and uncover its true purpose.