Detective School Q is 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.DDS [Dan Detective School]
Classes in DDS are based on the entrance test score, with A as the highest, B as the next lower, etc. It is possible for a student to be transferred to a higher class or vice versa, depending on their academic performances. However, Class Q is a special case. As the name might suggest, Class Q is for the Qualified students (i.e the specially chosen few) who are viewed as the most potential candidates for the successor of Morihiko Dan in the future. Yet, the same rules as the other classes also apply to Class Q. Any member of Class Q may be transferred to a lower class if his/her academic performance declines. Since Class A was generally regarded as the top class of the DDS before Class Q was formed, there has been a tense rivalry between the two classes since.

Kyū Renjō (連城 究, Renjō Kyu) [Q]Age: 14
Height: 161cm
Weight: 53kg
BloodType: O
A bright, sweet and optimistic boy who is also a brilliant detective, but a little awkward in social situations. Otherwise, he is considered to be the team's leader and is known for his logical explanations of cases. He has a good sense of judgement regarding to people (when everyone distrusted Ryu, he expressed his open appreciation for him) but often says things that infuriate Megumi (one of the series's running jokes is that he glimpses the pattern of Megumi's underwear and announces it out aloud for all to hear, only to be smacked or injured in some way by Megumi herself). But even though he acts this way, he cares for her, as shown when they where trapped in a secret door in the old school building. He did everything he could to help Megumi as she struggled after getting bitten by a pit viper, even opening up the pipe system to send Ryu and the others an SOS
Kyū 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. When he was six years old, he was kidnapped and held as a hostage by some criminals, but his mentor rescued him. In reality he was none other than Kyu's father (Satoru Renjou, Morihiko Dan's partner and right-hand man). Realizing the high risk of being a detective, Satoru formerly married Kyu's mother in secret to keep his new family safe. After Renjou's death, Kyu's mother hid the truth from Kyu for years, trying to shield him from the danger that the life of a detective is always in; after he was accepted in the DDS, Mrs. Renjou changed her mind and supported him fully. One of his favourite words after solving the mystery is "There could only be one answer!!"
Ryū Amakusa (天草 流, Amakusa Ryū)Age: 14
Height: 166cm
Weight: 50kg
Blood Type: AB
Ryu is very intelligent, and his dark background somehow links him to the organization known as Pluto (瞑王星). 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.
Megumi Minami (美南 恵, Minami Megumi)
Age: 14
Height: 163cm
Weight: 47kg
Blood Type: A
Commonly referred by her friends as just Megu, she has a unique talent of having a photographic memory ("Shunkan kioku" 瞬間記憶 in Japanese), 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 a crush on Ryu. She studied 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. She also sometimes blushes while looking at Ryu.
Kintarō Tōyama (遠山 金太郎, Tōyama Kintarō)Age: 18
Height: 180cm
Weight: 70kg
Blood Type: O
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. Kinta often mocks Kazuma's high tech approach to detective work, preferring instead to rely on his "instinct". His tough personality as well as his excellent senses have been very useful at times. He is very strong and sometimes hits either Kazuma or Kyu. He also repeatedly tries to pick up girls (with little success).
Kazuma Narusawa (鳴沢 数馬, Narusawa Kazuma)
Age: 11
Height: 142cm
Weight: 38kg
Blood Type: B
Kazuma is a rich, well known computer game programmer. He often helps to find information on his laptop computer, which he carries around with him all the time. At first after learning that he was a member of Class Q (which at the time was believed to be the lowest) he tried to get transferred in Class A. However, when his classmates came to his aid when he was in trouble he changed his mind, preferring to stay with his friends. Kazuma has a friendly rivalry with Kinta due to their different approaches to detective work. Kazuma and Kinta are often the butt of each others jokes. He is a very smart prodigy, but he can't get right answers without his "lucky" hat as implied in episode 3; he seems to get over this flaw by the end of the TV series.
Morihiko Dan (団 守彦, Dan Morihiko)
Born in 1936, Morihiko Dan 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. Morihiko Dan 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 (some of the top-level detectives at DDC and instructors at DDS were the first generation students of DDS). Among many criminals they fought, the most powerful one was the crime organization known as Pluto (冥王星, Meiosei). Although Pluto was finally thought to apparently have been destroyed, it wasn't without cost. Satorou Renjo , Dan's most prominent apprentice and heir-apparent was killed, and Mr. Dan was forced to be in a wheelchair for the rest of his life. Years later, there are signs that Pluto was being resurrected. 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.
Pluto
Pluto (冥王星, Meiosei) is a crime organization which acts as a "murder designer". At a client's request, it will create a perfect, fool-proof murder plot. The organization guarantees that if performed correctly, there won't be enough clues and or evidences to link the murder to the clients who ordered it. Each job will cost half of the client's entire assets. However, the organization will not actually perform the murder(s) themselves. The client will have to do the killing(s) him/herself. Most plots created by them were so fool-proof that only a very high-skilled detective can reveal the tricks and plots. Dan's Detective School was one of the few groups that can do so, and stopping Pluto's diabolical schemes. In order to keep their identity a secret, hypnotism will be carried out on the approachers if the murder case is solved.
They "disguise" themselves using plastic surgery, wigs and make-up. However, their identities can be revealed by a certain Pluto Tattoo, which appears on every member.
i love Detective Academy Q very much... i have their whole set of comic till the end of the episode... and now their acting it as drama... Yahoooo.......love it love it...this story os not tt bored cause their case n their clue is given quite easy to understd...i love Q n Ryu the most...their so cool n intelligent...Ryuu so cool man..Ryuu's background quite complicated one...but it is interesting...they have the rights to go for investigation and all the police respects them a lot...muz go and c it ya..haha...