Shinjuurou is approached by Yajima, an old friend of Rinroku, who found a piece of manuscript in a book given to him by an inmate whilst he was in prison. After discovering Yajima's wife Takiko's fingerprints on the paper, Shinjuurou informs Rie, who investigates how the book relates to Rinroku. Shinjuurou later hears from Yajima about how his children disappeared and his wife went blind, allegedly having an affair with Rinroku. Shinjuurou looks at all the books Rinroku bought from the Yajima family, finding more hidden codes which are revealed to be from Yajima's children. As it turns out, Rinroku had helped the children and placed them in child care to avoid Takiko's neglect, and they are soon reunited with Yajima. Afterwards, Shinjuurou confronts the prisoner who gave Yajima the book, learning something shocking.
Un-Go is set in a war-torn Tokyo, in a near-future Japan. In response to Japan sending their military abroad as peacekeeping forces, terrorists launched multiple attacks on Japan, killing many people and destroying much of its cityscapes. Some time after the war receded to a period of uneasy peace, the Japanese Parliament passed the "Information Privacy and Protection Act", which gives the Japanese government control over the Internet. Detective Shinjuurou Yuuki and his strange partner Inga make a living in solving crimes and exposing human souls, all influenced in some way by the dystopian backdrop.
