Inui tells Saki that it was Kiroumaru who rescued him after he collapsed, but he was subsequently taken prisoner. Saki receives a package and a letter from her mother which details the location in Tokyo of an ancient weapon called the "Psychobuster", devised by normal humans to kill psychics. Saki and Satoru visit the imprisoned Kiroumaru, who offers them his help in finding the weapon's location. The trio depart with Inui a submarine device to search for the Psychobuster and eventually reach the desert ruins of Tokyo. However, they are detected and soon after arriving in the dangerous wasteland, they learn that Yakomaru, along with his army and the Fiend have followed them there.