Ango Sakaguchi

Assistant Counsellor at the Ministry of Internal Affairs' Special Abilities Division, a man who wears round glasses and a suit. He is 26 years old, 178 cm tall, weighs 62 kg, has blood type A, likes intellectual women, and enjoys antiques, memories, and materialism, while he dislikes overtime, all-nighters, and betrayal. He is so competent that he rose to the position of Assistant Counsellor at a young age and excels in information gathering and analysis, being tough and skillful enough to operate as a triple agent. He is accompanied by two highly-skilled bodyguards.

Four years ago, he infiltrated the Port Mafia as an exclusive informant to monitor their movements and reported to the Special Abilities Division. During that time, he inadvertently caused the indirect death of Sakunosuke Oda by bringing "Mimic" to Japan as part of Ōgai’s mission, earning Dazai's resentment. He was friends with Dazai and Oda in the Mafia, and after Oda's death and Dazai’s departure from the Mafia, he requested "Agency No. 7" to cleanse Oda’s background as a token of atonement.

During the three-way conflict, while negotiating a plea bargain with Dazai regarding Kyouka’s custody, he was attacked by the "Guild" and the airbag in his car failed to deploy, resulting in severe injuries. While hospitalized, he received treatment from Yosano in exchange for a deal involving Kyouka and later, after the war, he arrested Melville and sought information on the "Guild".

During the confrontation with "The Rats in the House of the Dead", he worked with Dazai and Fitzgerald to capture Dostoevsky. When Mushitaro's ability was disabled, Dazai was arrested by the "Hunting Dogs" and the Detective Agency was framed as terrorists by "Five Men of Heaven’s Decline". He pretended to pursue Atsushi and Kyouka, who had escaped with Mushitaro, only to protect them, following signals from prison and supporting Atsushi, Kyouka, and Montgomery. When trying to extract the location of "The Page" from the captured Sigma, he showed intense anger towards him for stabbing Commissioner Taneda. He feels unfairly treated as Kyouka and Montgomery are kind to Atsushi but harsh to him. To prevent Fukuichi's "Great Directive" from being implemented, he proposed to the Prime Minister that it could only be executed if the vampire army advanced, under Dazai’s instruction. Additionally, he engaged in a plea bargain with a prisoner in Merso to transmit information to Dazai and to secure the central control room using the prisoner’s ability in exchange for a reduced sentence.

Fallen Theory (daraku-ron)

A memory extraction ability that reads "memories" imprinted on objects. By touching the floor, he can trace escape routes and seemingly even read memories from floors or people based on Mushitaro’s lines.

The ability’s name is derived from the essay by the literati Ango Sakaguchi, after whom the character is named.