Ango Sakaguchi/Synopsis

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Dark Era Arc

 * Note: Incomplete

In the prologue, he meets Dazai and Odasaku in their usual bar, having come from a deal in Tokyo. He shows them the object of the deal, an antique watch. Dazai asks if he has a camera, which he does, and all three take a photo together. The next day, he was reported missing right after he bid farewell to his friends the night before.

Soon enough, Oda locates and saves Ango who was discovered as a spy and had been set up to be killed. It is soon revealed that Ango is also a spy infiltrating the mafia, having come from the ministry that worked for the Port Mafia to watch the mafia's activities. Mori had known about knew this and used him to spy on Mimic's movements overseas, making him a triple spy. This revelation creates a gap between him, Dazai, and Oda. Consequently, Ango takes his leave from their usual hangout, Bar Lupin.

The Guild Arc
During the middle of the three-way organization war, Dazai contacts Ango and meets with him at a carpark together with his two escorts. Dazai initially greeted Ango cheerfully, but his real aim was the gun tucked in Ango's waist. Dazai immediately cocked the gun at Ango's head mockingly praising Ango for coming and asking if he actually thinks he has forgiven him. Ango pointed out that he was the one who cleaned Dazai's records, which allowed Dazai to join the Agency and owes him that. Dazai, with Ango's bodyguards aiming to kill him if he moves wrongly, concedes. Dazai also points out that Ango knew that that situation will happen, and so kept his gun without bullets. Dazai then proposes a ride around town in Ango's car, to which Ango agrees.

Ango and Dazai talk about the Guild, and Dazai subtly urges Ango to make a move on them, being the Department that handles Ability Users. Ango then reveals that the Department has been aware of the Guild's activities, along with other specifics regarding the organization, including the fact that each of the Guild members was given a diplomat's level of authority, and thus cannot be touched. Ango stops the car and asks Dazai to run and tell his subordinates in the Agency that they are in danger. At that moment, another car crashes with their car, crushing Ango's side of the car.

Ango is later seen when Dazai visits him in a hospital. Ango is severely injured, head covered in bandages and a cast on his right leg to his foot. Dazai then says that he brings good news: that Akiko Yosano will heal him from the injuries he sustained from the car crash, which turns out to be orchestrated by the Guild. Ango asks him what the price for that is, and Dazai plays innocent, pointing out that the Special Division for Unusual Powers and the Armed Detective Agency always help each other out. Ango catches on to Dazai's thought process: "The Special Division should also help out in this war." Dazai then says that the Agency wants to rescue Kyōka Izumi before the final showdown with the Guild. Ango says that, from what he's heard, Kyouka is being held in a UAV for isolating dangerous Ability Users.

Dazai asked for the Special Division to make the necessary arrangements. He asks Ango if it can be done. Ango confirms this but tells Dazai that it is only possible if Kyōka is a member of the Agency, which she isn't, as she hasn't passed the entrance exam. Ango then says that his authority is not enough to grant Kyōka, who is a mass murderer and not a member of the Agency, an amnesty; he instead offers assistance regarding the Agency's operations against the Guild. Dazai prepares to leave, but before letting him go, Ango reinstates their deal and says he won't go back on it then asks a question: "Is there a particular reason why the airbags on my seat were the only ones that malfunctioned when the car came crashing into us out of nowhere?" In reply, Dazai gives him a dark smile.

Following the crash of Moby Dick, Ango appears annoyed as the war will cause him a lot of stress and work. Ango approaches Herman who is sitting on a bench nearby, and asks him for his co-operation. Herman responds that he would like to watch the sea for a bit to which Ango agrees and that if he can give them info, it'll save him from arresting innocent Guild members like him. Herman wonders why Ango thinks that someone of a mere rank and filer have that power and knowledge. Ango replies that it is because Herman was actually a head of the Guild two generations back. Herman then tells Ango that youngsters are so eager to bring up old tales. Ango then shows him handcuffs and tells him that they won't be needing it. The two then leaves the scene.

The Guild Aftermath Arc
Ango is called upon by Murakoso about a break-in of the Special Division document transport vehicle, in which an attacker has stolen a document with code name I-75-81-A. He then wonders why a document with no possible monetary value is stolen.

As Murakoso wonders what kind of document it is, Ango tells her that it contains a record of the death of Kyōka Izumi's parents at the hands of Demon Snow, revealing that they were on the government's side as former assassins. However, given their identities, Ango states that the government concluded the incident as an ability gone berserk.

Cannibalism Arc
Upon being contacted by Dazai, Ango and the military police arrive at a café to arrest Fyodor Dostoevsky. As an operative touches the latter, he instantly dies despite Dazai's warning. As Ango warns the Russian not to do anything else, he surrenders and agrees to go with them.

Decay of Angels Arc
One month after the events of Cannibalism, unable to contact Dazai, Ango calls Atsushi and asks him to relay a warning to his comrades that there might be a spy within the government conspiring with the "murder association" known as the Decay of Angels. Moreover, at an unknown point of time, Ango apparently allies himself with Dazai as one of his collaborators prior or during the latter's eventual incarceration.

Sometime after the Decay of Angels make themselves known, Taneda instructs Ango to kill — not arrest — the group should they encounter them. Ango finds his order conflicting with the law, but the chief reminds him that the mission of the Special Division is to ensure peace for the general populace regardless of the law and even if good people get involved or die along the way. Ango then reluctantly accepts his order.

After Taneda meets with and gets attacked by a Decay member after acquiring intel on the enemy alone, Ango and his escorts visit Taneda in the hospital. Despite seeing such dangerous meeting as an obvious trap, Ango acknowledges that Taneda met with the criminal to gain information using the chief's ability. Though he admits that he and Taneda are not that close, Ango vows to his escorts that he shall have crushed every single one of the culprits by the time Taneda awakens.

Later on, as the Armed Detective Agency is wanted for terrorism, Ango spots Lucy Maud Montgomery marching at the Special Division headquarters and defending the Agency's innocence. Nevertheless, Ango soon arrives at the government bank to catch Atsushi and Kyōka, who manage to infiltrate the facility to retrieve Mushitaro Oguri.

Ango immediately assumes control over the security forces and begins to search the building. Though they soon manage to almost corner the three, they find themselves tricked and are unable to catch their targets in the bank. Ango examines the floor of the empty room using his ability, only to discover there is no single trace of ability having been used. Just as the three are about to find a runaway car and escape, Ango shoots Atsushi and Kyōka with tranquilizing darts, leaving them temporarily incapacitated and unable to attack.

A perplexed Mushitaro asks Ango how he managed to discover the three of them, with which Ango explains about his memory-extracting ability and that he extracted the memory from the dropped cash that they have been using to conceal themselves. As Ango holds Atsushi at gunpoint, instead of turning them in, Ango pushes them into the sewer and helps them hide to trick Fyodor into thinking that they are against each other.

In truth, he and Dazai have been allies from the start; upon Dazai's imprisonment, Ango has been acting as his middle-man by decrypting the numerical code from Dazai's vital signs tracker that Dazai sends by manipulating his heart rate. Ango then explains that he is not a member of the Seventh Agency as Mushitaro believes, and the rumors were one of Fyodor's lies to prevent him and Mushitaro from seeing each other.

As they seek refuge in Anne's Chamber, Ango confesses having employed the Seventh Agency once to clear Dazai's crime records so that he can live outside the mafia for the sake of their mutual friend. He remarks that an alliance between Fyodor and the Seventh Agency will be the worst possible alliance. Ango, Atsushi, and Kyōka then ask for Mushitaro's information on the Decay of Angels. Initially reluctant, he warns them that any news they hear from him shall become the worst possible news they ever learn.

Ango asks what the organization really is, to which Mushitaro explains that the Decay of Angels is a five-man murder association headed by an "overseer". Though he does not know their end goal, he tells them of the previous steps and the step before their end goal, which is to eliminate the country using the back page of the Book within ten days. Getting distressed with such news, Ango soon escorts Mushitaro out of the chamber and to relay the information to Dazai.

In a back alley, Ango plans an infiltration mission with Atsushi, Kyōka, and Lucy, which is to halt the enemy's third stage and to retrieve the page from the enemy. Ango deems Lucy to be the heart of their strategy, with her ability vital in infiltrating the enemy without being noticed. Per Dazai's plan, they are to head to the Sky Casino whose coin bombs shall be used by the terrorists to cause firsthand slaughters and an economic halt that might possibly cause a global economic crisis. Hence, they are to capture casino manager Sigma, a Decay of Angels member who knows the page's location; prevent the terrorism; and gain the Hunting Dogs as allies. Ango soon asks Lucy to transport Atsushi and Kyōka to Anne's Chamber and head to the casino.

Eventually, Atsushi saves Sigma while falling off the casino and lands atop a hanging electric box. Ango communicates with Sigma through Atsushi's phone, demanding him as the one who stabbed Taneda to spill the page's location, even through torture if necessary. Finally giving up, Sigma agrees to cooperate, claiming that he does not know why he was born after all.

Ango instructs Atsushi to escort Sigma to the ground, but they face Hawthorne levitating before them. Ango warns Atsushi that he might have come to save Sigma, but Hawthorne unexpectedly attacks Sigma with his blood bullet. Atsushi grapples to save Sigma before getting attacked in the forehead as well, though Sigma eventually lets go of his hand and falls off the sky. Ango then notifies Lucy to help Atsushi; unable to find any material to grab her by, Lucy jumps off the ledge in an effort to bring Atsushi and herself to her dimension.

Hawthorne ends up entering the chamber as well, but Anne soon imprisons him into Lucy's secret room. Lucy rejoices with capturing their enemy, but Ango tells them that they failed to retrieve the page's location and are even witnessed by the Hunting Dogs saving Sigma, a "fellow terrorist" in the government's eyes. He fearfully regrets that everything played out according to Fyodor's schemes, ending in their utter defeat and failure.

DEAD APPLE
Ango meets Dazai in front of Bar Lupin in the middle of work. Not long after that, two of his subordinates point guns towards Dazai, accusing him of having brought Tatsuhiko Shibusawa into Yokohama, the person responsible for the Dragon's Head Conflict, a tragedy six years prior the event. A moment later, clusters of fog start to rise around his feet as Shibusawa appears behind him, taking away Dazai.

Ango later contacts Doppo Kunikida, reporting that the fog has engulfed the entirety of Yokohama, disconnecting Yokohama from the outside world and confirms that only the gifted are present after he manages to locate each of them. The fog also causes the gifted to be separated from their ability, thus Ango warns Kunikida and the rest of the Agency to be careful. Ango also requests the Agency to eliminate Shibusawa as the mastermind of this incident and gives them Shibusawa's current location.

In order to defeat the Dragon, Ango calls upon Chūya Nakahara, which in turn decided to break into the walls of the government facility Ango's currently in. Chūya blames Ango and the rest of the government bureaucrats having employed Shibusawa six years ago in order to end all the city's conflict which ends up backfired, creating an even bigger conflict instead.

In his defense, Ango states that all he did was for the peace of the nation. In exchange for Chūya's assistance, Ango states that he wouldn't mind if Chūya wanted to take his life. Chūya then agrees and proceeds to commence the operation.

As the fog begins to spread farther from Yokohama that will soon engulf the globe, Dame Agatha Christie of the English organization known as the Order of the Clock Tower contacts the Special Division and informs them that they have dispatched an incineration-type ability user to contain the situation in Japan and prevent further spread of the fog. To Ango's dismay and disbelief, Ango anxiously retorts that Yokohama will be incinerated.

After the incident is finally sorted out, Ango is seen with his subordinate, Mizuki Tsujimura, pulling off their current day four of all-nighter marathon, writing reports upon the incident's aftermath. Tsujimura then asks Ango about his thoughts of the incident, in which Ango replies that the incident might be fundamentally caused by Shibusawa's isolation and loneliness. As he continues to think how everything is caused by his extreme intelligence, he finally notices that Tsujimura is already sleeping.