If you're looking for manga similar to P.D. Agency no Hokokusho, you might like these titles.
Shion and Kuon were twin sisters. One day, Shion who was an idol unexpectedly commits suicide. However, Kuon has a hunch that Shion was killed. In order to find her killer, she enters showbiz as an extra. With the help of newbie actor Ryuuto, who is said to have been Shion's lover, Kuon investigates and one by one the darkness of the showbiz world becomes clear.
Totonou is a young man who stands out–partly for his bushy hair, partly for his finely honed abilities of observation and deduction. When Totonou is accused of murder, he puts his skills to work delving into the lives of the cops investigating him and uses his insights to find the real murderer. After clearing his name, all Totonou wants to do is return to his laidback, mundane life, but he can’t help but be drawn into one mystery after another. In his own blunt but gentle way, Totonou is just trying to make sense of a chaotic world.
Judges are the messengers of the Central Government, sent out to punish delinquent cities. They have the ability to control programmed "seeds", causing explosive growth. After a disease breaks out among the "Children of Babel", those Judges who're given power through Central's research, Central requires the data of a natural Judge like Sion. However, Central is also interested in the legend of the "Heavenly City", which Sion is named after; what could their true purpose be?
Karin Mochizuki is an attractive woman lawyer. Because she is always calm and collected and never lets her feelings show, she's been nicknamed Stone Cold (a woman colder than a stone).
The shinden (temple knights) are held responsible with the duty of fighting demons for the sake of the holy maiden, who's the symbol of the church. The holy maiden, unique to this country, exists to help save people from a mysterious illness that happens around the time of a new moon. Due to this, many people became followers of the church. Murray, a shinden, was brought up under the holy maiden's guidance, but, what kind of mysterious living is it if he supports the holy maiden, involuntarily? Even if he knew the church distorted its teachings.....?