The story of a group of young students from Class Q of Dan Detective School (DDS), a prestigious and renowned detective academy founded by Morihiko Dan, the most famous detective in Japan, and the adventures and mysteries they unfold and solve together. They eventually work against Pluto, a mysterious organization which creates almost fool-proof plans that only a handful of detectives can solve.
(taken from Wiki)

Picture	Name	Description
	Renjo Kyu	A bright, sweet and optimistic boy who is also a brilliant detective, but a little awkward in social situations. He is considered to be the team's leader and known for his logical explanations of cases. He has a good sense of judgement regarding to people, but often says things that infuriate Megumi. Kyu had been a single child of a single parent (his mother) for as long as he could remember. He didn't have a father, but there's a certain man who had been acting as his mentor when he was little, he was none other than Kyu's father. One of his favourite words after solving the mystery is "There could only be one answer!".
	Minami Megumi	She has a unique talent of having a photographic memory, allowing her to memorize a scene instantly. This allows her to notice if a piece of evidence has been moved or is missing. It is believed that she has somewhat of crush on Ryu. She studies in the Tokyo National Talent Development Research Center alongside Yutaka Saburomaru. She lives with her older sister Akane (who attends a local university) as her parent work abroad.
	Amakusa Ryu	Ryu is very intelligent, and his dark background somehow links him to the organization known as Pluto. When his parents died, Pluto took care of him. As a child he was never allowed to socialize with others. He often viewed his house as more of a prison than a home. Even with his cold personality he is still friendly with the other members of Class Q, and shares a special link with Kyu, since he was the first one who could understand him.
	Narusawa Kazuma	Kazuma is a rich, well known computer games programmer. He often helps to find information on his laptop computer, which he carries around with him all the time. He is a very smart prodigy, but he can't get right answers without his "lucky" hat.
	Toyama Kintaro	Kinta is the son of a well respected police officer, but moved out due to a family dispute. He now lives alone and works part-time as a mascot on the seafront. Kinta is the strongest member of the class, having had lessons in judo, kendo and karate. He also has superb senses, especially his eyesight and sense of smell. His tough personality as well as his excellent senses have been very useful at times. He also repeatedly tries to pick up girls (with little success).
	Dan Morihiko	Dan Morihiko is the founder and principal of Dan Detective School, and a famous detective who has solved many cases, and is the only private detective in Japan who is licensed to hold a gun. He was a former police officer who resigned to open up a private detective company of his own, Dan Detective Company (DDC), the parent company of DDS. He was assisted by a young boy named Satoru Renjo, who acted as his partner, assistant, and apprentice. Together they helped build DDC and DDS into a top level detective company and school. Realizing that his days were numbered due to his old age, Morihiko Dan decided to open a new, special class called the Class Q, consisting of several extremely talented persons. He would train them, analyze each one of them, and appoint the best student of this class to be his successor.