The main character is the 23 years old Riko Rinda aka "Q", an all purpose appraiser, which with her wide range of knowledge, her great memory and her reasoning, she can detect the true value of everything.

Sasaki Rena is a beautiful woman with excellent memory and intelligence. She becomes a private detective and risks her life to chase down evil private detectives, because her younger sister was murdered by a stalker. The person that provided information to the stalker on her sister's location was a private detective.

A high school dropout and NEET, Ayana Asakura's fate changes dramatically when Naoki Ichijou, an elite bureaucrat, discovers her talent for lateral thinking...!? (Source: Kadokawa, translated)

The series centers on Yui Yūri, the daughter of a death row convict imprisoned for enacting the "greatest terrorist attack in the Heisei era." At the time, Yui was nine years old, and was judged not to have been involved in her father's activities. Now she is a second-year high school student at Takekura Kosugi High School, where the Japanese prime minister and his security detail are conducting a visit. But a paramilitary force assaults the school and takes the prime minister and the students hostage, without issuing any demands. In the middle of the crisis, Yui tries to find a way to get out.

The novelist Lina Sugiura meets the up-and-coming writer Shogo Iwasaki at a magazine interview. This encounter causes Iwasaki to offer a recommendation for the obi of Lina's next book. However, just before the release of her new book, there were suspicions that Iwasaki's novel was plagiarized!? What is the truth...? A literary mystery set in the publishing world! (Source: ComicWalker, translated)

"I want to know all about detectives, but I have no desire to be a detective." Ever since the day a crooked detective's tip-off led to the murders of her family, Sasaki Rena has been bent on exacting vengeance. With this goal in mind she joins the Detective vs. Detectives Division of the Suma Research Company, whose goal is to crack down on unethical detectives. **Note:** Matsuoka started publishing the original novels in 2014, with four volumes total. A spin-off, titled *Tantei no Kantei (Detective vs Appraiser),* consists of two volumes and concludes the storyline from the main series. He also wrote another two volumes of the original series. *Tantei no Tantei* inspired an 11-episode live-action television series in 2015.

The novel follows detective Sherlock Holmes on a trip to Japan, where he teams up with Japan's first Prime Minister, Itou Hirobumi, in order to solve a mystery that has international implications.