Yutaka Katô

Izumi Sakuragi is a new police sergeant with the Special Investigations Office, which was set up within the Metropolitan Police in November last year. The new investigation team uses DNA analysis and the latest in forensics science to investigate cold cases as well as cases suspected to involve missing persons.

Narrates the events and cases encountered by Kaoru Utsumi, a rookie detective, and Manabu Yukawa, a university associate professor, while the two pair up to solve many mysterious cases.

Murasaki Wakako, who is 26 years old, loves going out alone to enjoy eating and drinking, especially when something unpleasant happens at work. Thie show follows Wakako through many solitary outings, where she enjoys different combinations of food and drink!

Enomoto Kei is a security "otaku" working for a security firm, devoted to improving the securities system on a daily basis. He is not an easy person to familiarize oneself with, always collected and calm, unapproachable, a maniac in Physics, Science, Architecture and profound in other basic theoretical foundation. He is certain and proud of the fact that there is no key which he cannot unlock. One day, Kei is asked to help reveal a mystery behind a locked room murderer. While he lacks any interest in solving the mystery, he is inevitably intrigued by the term, "Closed Doors" and decides to take on the position. He works side by side with Aoto Junko and Serizawa Gou, who are lawyers working at a major law firm. Junko is pure and forward, acting upon her instincts while Serizawa is a prideful elitist who sees time as money, and therefore, will not take on any job that is unprofitable. Possessing a vast amount of knowledge and acute insightfulness, Kei is able to unlock the closed doors and unravel the secrets leading to the solution. Never before has there been a drama focused solely on closed doors.

Makoto who is working in Brazil is back in Japan for a short stay. However, not having a place for the week she stays over at Toru's house. Their lifestyles though are not exactly good matches and soon the tension begins to simmer