Sakaido/History

## Background

Brilliant Detective Sakaido was created around six months prior to the start of the series after the formation of the Kura, and was used to bring at least four serial killers to justice, all of which would go on to be driven to suicide by Akihito Narihisago.

## *ID: INVADED*

### **FILE: 01 Jigsawed**

Sakaido awakens inside of Fukuda's id well, dazed and confused, before suddenly breaking apart, his various body parts floating around. He screams in horror but soon realizes that he can still control his body despite its fractured state. He is able to put himself back together (bar a few sections of his left arm), and analyzes his surroundings, put off by the broken, fractured world he's in. Upon seeing someone's leg dangling from another section of the house he's in, he walks towards it, only for the floor to collapse underneath him. However, he is able to grab the ledge with his disembodied hand, and wonders if he is supposed to fix the broken void he's in.

He tries to call the person on the other section, but to no avail. Instead, he uses his arm to pull it towards him, connecting the two together and allowing him to walk through the door. Inside, he realizes the leg belonged to a corpse; a woman who has been stabbed in the chest, whom he imminently recognizes as "Kaeru", which in turn, allows him to remember more about himself: that he is Sakaido, the Brilliant Detective, whose purpose is to solve Kaeru's death.

   Finding little clues in the room he's in, Sakaido reassembles the house and begins exploring the other rooms, first arriving in a study, lines with books leading to a desk. He discovers a framed photograph of several people, wondering if they're the family that owns the house, but finds little else. Moving on, he enters the living room and meets seven other people, all of whom have various parts of their bodies missing, much like his left arm, and claim to be a family. He takes them to see Kaeru's body, but none of them recognize her, though they comment that something is wrong with her. Sakaido claims that although the world is normal to them, it isn't to him, and it's his job to question it. Thusly, he starts rebuilding the world, eventually putting together enough pieces to spell out the word "Takoya", and tries to figure out its meaning.

The world begins breaking apart, however, and he wonders if "broken" is its natural state of being, before making his way back to Kaeru. Analyzing her further, he realizes how odd it is that everything else in the space, including himself, is broken to a degree, yet she is completely whole. Realizing that someone is hiding inside of her, he orders them to get out, forcing Fukuda to reveal himself, even more broken than the others. As he wonders if he should arrest him, he notices Koharu Hondomachi suddenly appear, who requests that he leave once he solves the case.

### **FILE: 02 Jigsawed II**

Sakaido confirms that he intends to leave once he's done, before turning back to Fukuda, who flees the room, moving between the broken pieces of the house as if they were still whole. He jokingly asks Hondomachi if she can explain his movement, but notices that she and the others have become terrified of another man, John Walker, also in pieces, with his face obscured by red glitches, who leaps over to join them. He raises his cane, and Sakaido, assuming it's an attack, immediately knocks him out, to his surprise, before moving on with the investigation.

While trying to figure out why Fukuda didn't leave Kaeru's body and flee when he had the chance, he comes to the conclusion that not only does Fukuda perceive the world as completely normal, as it is a result of his own fractured mind, but also that he feared John Walker, and hide in Kaeru's corpse to avoid him. He then notices Hondomachi suddenly stand up and glare at where Fukuda is standing, before demanding she be let go. Sakaido is then extracted from the id well, much to his surpise, and put into Hondomachi's.

There, in a foggy world full of massive drills, he sees Kaeru hanging from a tree, with her shoes neatly placed in front of her with a note plainly stating that she killed herself. With no mystery to solve, Sakaido wonders what's the point of his being, and questions why Kaeru's feet are tied, before promptly being crushed by a drill.

### **FILE: 03 Sniped**

Sakaido wakes up standing in Koji Huyukawa's well with a crowd of people as the floor rises into an tower surrounded by a waterfall. He is then shot at, the bullet grazing his cheek, before a flurry of bullets starts killing people, sending the crowd into a panic. Sakaido then notices Kaeru, and, upon remembering his name and purpose, deduces that there is a sniper, and after the crowd begs him to, he gets down, the shooting promptly stopping, suggesting there is only one sniper. Examining Kaeru's body, he notices something wrong, but is unable to figure out what, before being shot dead.

Sakaido is reinserted, only to die almost immediately, seeing Kaeru's body and remembering his name as he dies. He is inserted yet again, and takes refuge by the wall, theorising the possibility of multiple snipers based on the change in the bullet's trajectory. After watching someone jump off the structure to his death, and wonders if it's the better choice, before refocusing on his mission. Investigating Kaeru's body, he hears a woman try to leap to her death, but catches her at the last second, noticing that the man who jumped off the other side is now directly under him. After being shot in the shoulder, forcing him to let the woman die, Sakaido realises that the tower is rotating, which allows the sniper to appear as if he is shooting from everywhere at once. He deduces that after Kaeru was shot, she noticed the sniper and tried to point at them, but the rotation of the tower made it moot.

He then notices a man (Huyukawa) slowly crawling across the floor, encouraging others to run around randomly while he relishes in their deaths. Following him, Sakaido wonders if the cycle will repeat once everyone is dead. Huyukawa realises he's been figured out and warns him not to stand too high. However, since he has solved the mystery, Sakaido ignores him and allows himself to be shot.

### **FILE: 04 Extended**

After cognition particles from the Gravedigger are found, Sakaido is sent into his id well. Waking up inside a desolate, abandoned apartment, he explores until he finds a burnt corpse, recognising it as Kaeru. Examining it and the surroundings, he goes to look out the window, revealing that he is inside two giant, flaming, shifting apartment complexes, with extending shipping containers connecting the two. Wondering how Kaeru could burn when there's no sign of a fire, the apartment suddenly explodes, forcing him to jump out the window. Before he can, he notices a young girl (Keiko Kikuchi) looking at him from the top floor, which distracts him long enough for the explosion to knock him out to his death.

After being reinserted, Sakaido repeats his actions up to being knocked out the window, this time being able to grab onto a loose pipe. Crawling into a corridor, he opens a door, only to be killed by another explosion. After a number of reinjections, he is eventually lucky enough to fall onto a moving shipping container. He reassures Kikuchi that he'll save her, only to die again.

Multiple deaths later, Sakaido manages to make his way to the other side. He remembers that his purpose is only to solve Kaeru's death, not save Kikuchi, despite his wishes, and wonders how she could have been burned despite the room showing no signs of fire before he is blown up yet again. After another injection, this time running away from the explosion, he leaps from the window and grabs onto a container, which begins falling apart, forcing him to run across and climb up a pipe. After an explosion shakes it loose, he leaps off it and jumps towards Kikuchi, grabbing the ledge and climbing in.

She hugs him, telling Sakaido that the entire building is on fire and filled with dead, leading him to wonder why she's still alive. He deduces that Kaeru was killed elsewhere then moved after her death to make it seem like she was the victim of a fire started by someone else. He thanks Kikuchi, and picks her up so they can leave, but she points out Genpei Oono, who is standing in the opposite complex watching them. She says that he's a failure and burned down his house to start over, and that he thinks she was spying on him, despite her protests.

Sakaido promises that she won't be hurt with him around, and they run off down a container as the world exploded around them, including Oono, who's death Sakaido shields from Kikuchi's eyes. They both thank each other for the help, and she asks Sakaido for his name.

### **FILE: 05 Fallen**

After Hondomachi and Kokuryu Matsuoka find Haruka Kazuta's cognition particles, Sakaido is sent into his id well; the sky. After falling to his death several times, Sakaido lands on an island with a house on it. He goes inside to find Kaeru floating in a pool of her own blood, and, upon remembering his identity, immediately notices that she was stabbed. Noticing the unnatural way the bloody has pooled around her body, he deduces that her killer killed him in mid-air to avoid a mess, then consciously spread the blood out in a deliberate manner. Looking underneath, he finds a strange girl whose features seem to be made up of multiple different people.

Sakaido asks her why she is there, and she tells him that there's a monster that she doesn't know the location of. He asks about Kaeru's, and she suggests he might be outside fighting the monster. Looking around for a weapon, he finds a vase and a torn photograph of several highschool students. Ignoring the latter, he leaves the house to search for the "monster", navigating the pipes sticking out underneath the island, coming across John Walker, who ruthlessly tears Kazuta apart while standing upside down. Furious, Sakaido throws the vase at his head, and when that does nothing runs towards him, the wind pressure keeping him from falling, only for Walker to evade him and leap off the island, carried by the wind pressure.

Returning to the house, he moves Kaeru's body and tells the girl that Kazuta died, prompting her to ask him to protect her.

### **FILE: 06 Circled**

As the two look out the window, Sakaido comments on the girl's shifting face, something she isn't aware of since there are no mirrors, saying that the only reason she looks like that is to protect her from the monster. They then notice Kazuta, who is still alive and hanging onto the edge of the island, asking for help. Sakaido notes that he seems to be asking her, but she reveals that's why she's ignoring him, seemingly confused by his statement and asking if there isn't anyone he has a crush on. Ignoring her, Sakaido goes outside and offers to help, but Kazuta declines, since the girl can still hear him. He is then extracted.

After Nahosi Inami is captured by the Kura, Sakaido wakes up in her id well, an empty train. Following a set of bloody footprints, he finds Kaeru, plus a knife next to her. Determining the footprints to be her killer's, he follows them in the other direction, coming across decaying bodies along the way, eventually ending up back at Kaeru, realising the train is connected in a ring. This time, however, he is greeted by Inami, a young girl, and asks her about Kaeru, noticing bloody shoes and a handkerchief on her person, but she says no, with Sakaido inclined to agree due to the lack of blood splatter on her and the fact that she hasn't disposed of them, suggesting the theory that the footsteps are Kaeru's.

He then notices Kazuta, sitting on the other side of the cart, who is unnerved by his gaze, promoting Inami to scold him, scoffing when he asks if she's his girlfriend. Reflecting on his clues, Sakaido theorises that after being stabbed, Kaeru circled the train covered in blood, and asked Inami to wipe her feet off, which she confirms, despite not knowing why. Sakaido however, realises that Kaeru did it to lead him to that specific point to meet either Inami or Kazuta, with the former asking him when they'll reach the station.

Looking at Kazuta, who again reacts to his gaze, Sakaido teases them, to Inami's annoyance, who says she hates the thought of staring at a dead body. Realising that the two are staring at each other through the window reflection, he offers Kazuta to join them, but she harshly rebukes him, saying she prefers it this way.

Pondering over Kaeru's suicide, Sakaido struggles to see the meaning in her death and the endless train journey they're on. Breaking down into tears, he expresses his desire to save Kaeru, reassuring her that she doesn't have to die.

### **FILE: 08 Desertified**

After Miyo Hijiriido is trapped inside an id well within Narihisago's id well, Sakaido and Anaido are sent into what is assumed to be Hunetaro Momoki's id well. Waking up, neither can remember their names until Anaido points out Kaeru. Sakaido turns her over, and upon seeing her face, they both remember their names and status as brilliant detectives. Brushing off Anaido's eccentric greetings, Sakaido tries to focus on the crime scene, deducing Kaeru died of organ failure after dehydration, before noticing the marks on their wrists, wondering if they had watches, with Anaido proposing they track the thief down, but Sakaido stops him, realising that without food or water they'll soon exhaust themselves and die. To prevent dehydration, Sakaido has them both urinate on their clothes and wrap them around their heads.

Now prepared for the desert climate, Anaido proposes they pursue the "watch thief", but Sakaido instead wants to continue surveying Kaeru's body, taking note of Kaeru's torn dress. Eventually, Anaido leaves on his own, leaving behind a tail for Sakaido to follow, who apologises to Kaeru on his behalf. After thoroughly examining Kaeru's body, he catches up with Anaido, noticing how worn down he is. Anaido reassures him, and asks if he thinks they'll find a way out. Sakadio disagrees and points out the sun hasn't moved from its zenith, something Anaido noticed earlier, and wonders of the Earth's rotation has been altered, but Sakaido dismisses the idea that the world is anything but the desert they're in, leading Anaido to wonder if once they solve the case, the world will lose its reason for existing. Sakaido then points out an eagle flying overhead, but then suddenly falls down a hill into a pit of quicksand.

Laughing, Anaido tells him to escape using hell as an analogy for holes, informing Sakaido to slowly crawl out rather than squirming, finally acknowledging him as a brilliant detective. Anaido admits that all he did was apply general theory and hoped for the best, calling Sakaido his brother, the two finally coming to understand each other. They press on, gradually growing weaker, and Anaido volunteers to die helping Sakaido live, since one of them must survive to solve the case, but Sakaido tells him not to, having found the watch thief in a pit of quicksand, both of them breaking into hysterics at the sight. They dig up his face, before Anaido notices something else buried in the sand, digging up a Mizuhanome, though they have no idea what it is.

The two examine it, theorizing that the watch thief wanted them to find it. Anaido looks at the screen above the chair, and sees it's connected to a "well source" linked to "Kiki Asukai". Though the name isn't familiar to either of them, Sakaido decides to enter, instructing Anaido to eject him after ten minutes. Despite feeling a foreboding sense, Anaido agrees and Sakaido settles in, confidant in their deductions as brilliant detectives as he is ejected in.

### **FILE: 09 Inside-outed**

After waking up inside the second-layer id well, Sakaido regains his memories of being Akihito Narihisago, and shifts to that identity for the rest of the perceived two years he spends there.

### **FILE: 10 Inside-outed II**

After waiting ten minutes relative to his time flow, Anaido ejects Sakaido and asks him what happened. Sakaido wakes up crying, unable to remember anything he experienced, and questions the markings on the Mizuhanome, bemused at Anaido's admitting to counting sand. However, he then remembers the tan lines on their wrists, realizing that they weren't watches, but straps of Kaeru's dress tying them to her body, and that Anaido had united them before Sakaido woke up.

Furious, Sakaido demands answers, and Anaido reveals that not only does he retain all his memories as Fukuda due to his injury, but he also investigated the scene beforehand, revealing the corpse to in fact be Narihisago, based on the photo of his family he found on his body. Showing it to Sakaido, he reveals his true identity as Akihito Narihisago and that they are in **his** well, causing Sakaido to regain his memories and trigger a well storm.

### **FILE: 12 Channeled**

After Takuhiko Hayaseura flees into his own id well to avoid arrest, Narihisago and Hondomachi pursue him as Sakaido and Hijiriido. Arriving in Hayaseura's id well, they watch as Uraido solves Kaeru's murder (having killed her himself) and Hijiriido questions what they should do, with Sakaido stating they surprise him. Uraido notices them, telling them not to be coy, Sakaido suspecting he expected them to be there, before he puts on a mask and vanishes. Jumping after him, Sakaido reluctantly puts on the mask.

He then finds himself in an id well comprised of countless mirror images of himself, soon followed by Hijiriido. Uraido notes that Fukuda chose not to dive in, which confuses Sakaido, but he dismisses it, vanishing once again, this time without a mask. Deciding that the vanishing skill must be a rule of the id well, Sakaido takes that to mean that any brilliant detective can vanish, doing the same himself.

They follow him into Hondomachi's id well, narrowly dodging a drill as it descends from the sky. Uraido then reveals Hijiriido's true identity, triggering a well storm before vanishing, laughing maniacally. Hijriido urges Sakaido to follow him and find the lightning id well to remember who he is before finding her again. Following her advice, he ends up in his own id well, finding his family's picture and remembering who he is, once more becoming Akihito Narihisago.

### **FILE: 13 Channeled II**

Sometime after the John Walker Case, Sakaido is used in a joint dive with Hijiriido.