With two map pieces secured, Sugimoto ans Asirpa continue their hunt for the remaining 22 tattooed convicts whose bodies hold the key to hidden treasure.
Masaharu "Masaji" Tachibana was a brilliant programmer who got burnt out and suddenly stopped showing up to work. He now lives at home with his parents and spends his time sleeping and playing video games. He only ventures out of his room to visit the local convenience store for more energy drinks and snacks, until one day he learns that his parents have decided to build a "2.5 family" house with his sister and her family joining them. Masaji is forced to acclimate and with the change of environment begins to venture out of his room and his own head.
A solitary young woman and a lonely widow make a tentative connection as a pile of fake money brings trouble to their lives and newcomers to their town.
Shinichiro Kosaka is a detective of the major cases unit of the Tokyo Metropolitan Police and on the path to become captain of the unit when he makes a mistake during an investigation. Kosaka was subsequently demoted to precinct duty, where he finds his new colleagues taking on small cases tirelessly with a sense of justice untinged by workplace politics and internal disputes.
A major newspaper has informally decided to employ a female university student. However, shock ripples within the newspaper because of a weekly magazine’s scoop that she is the daughter of the criminal in a serious case. This was the kidnapping of a newborn baby at a big hospital 20 years ago. The criminal demanded a ransom from the director of the hospital instead of the parents. But after the criminal had the large sum of money in hand, he died in an accident while being pursued by the police. The baby was never found. Kaji Hidekazu, a former hotshot journalist who has become deadwood in the wake of an incident, is ordered by the newspaper to re-investigate the kidnapping case. He finds out the shocking, tragic truth which had been kept under wraps.