Sirius Astronomical Observatory Murder Case

**Spoiler warning: *Plot and/or ending details follow. Read at user's own risk!***

## Details

### Host

Tōkichirō Endō
Yoshizono Ōe

### Number of Survivors

2

The **Sirius Astronomical Observatory Murder Case** was one of many Duel Noir events hosted by the Victims Catharsis Committee and the first case featured in *Danganronpa Kirigiri*.

The participants of the Sirius Observatory Murder Case are five members of the Detective Library, with Tadashi Asakura and Tōkichirō Endō acting as the Allurements of this case.

## History

### 1900s

The Sirius Observatory was established following the post-war economic boom of Japan, where its founder, Ryūichirō Kiba made a fortune off the iron industry. Following his retirement from the industry, he built himself a private observatory to seclude himself in.

### Prior to the Case

However, a year and three months prior to the Duel Noir, Ryūichirō would be taxed extra for committing tax evasion, as he was overdue. The government would go on to seize the items inside the observatory, and the building would go up for sale two months before the Duel Noir would begin. Officially, it would later be bought by an IT company, though it was just a shell organization for the Victims Catharsis Committee.

### Victim Scouting

The Sirius Astronomical Observatory Murder Case is hosted by Tōkichirō Endō; Tadashi Asakura is the Culprit selected and responsible for the murders that occurred inside the Sirius Astronomical Observatory. After meeting in a hospital, Tadashi meets with Tōkichirō in a park. The scout tells him about the organization and then says that he will reveal to him the identity of the real criminal of the one who murdered his family under one condition. Tōkichirō begins to tell him about Catharsis and, to get it, he must play a game called a Duel Noir, along the way telling him different rules. Having finished with all the rules, Tōkichirō says that he cannot tell him who the criminal is, until he agrees to participate in the game. He gives Tadashi one night to think it over and asks him to come to the park at ten o'clock in the morning. Tadashi accepts and says goodbye to the old man.

### Case Proceedings

Five detectives are contacted via letters by a Yoshizono Ōe to come to the Sirius Observatory on December 22nd at 3PM. These detectives were Yui Samidare (DSC 888), Kyoko Kirigiri (DSC 919), Eigo Amino (DSC 367), Shiita Enbi (DSC 245), and Kou Inuzuka (DSC 943)— with all five taking up the case to arrive at Hatesaki Station. As per the rules of the Duel Noir, Yui got another letter that detailed the crime scene as well. Once all five were at the station, they were escorted as close as they could towards the Observatory by a taxi van (as well as being given cans of coffee to refresh themselves). Once at the drop-off point, the Detective group walked in the snow until they arrived at the Observatory. With their proxy being a no-show, and the previous owner already ruled out of being the one that sent them the letter, they investigated the building and its furnishings.

Ultimately, despite their best efforts, they find nothing substantial that points towards their client. At around 8PM, when all five were discussing the situation amongst each other, they would be all begin to pass out as white mist filled up the room. When Yui had awoken she would find herself in a bedroom there, handcuffed to the leg of her bed. Lifting up the bed, she frees herself and goes out into the hall. There she discovered Kyoko, unconscious and with bloody sheers in her hands and a key to the handcuffs Yui is wearing. Kou, Shiita and Eigo having been decapitated in their own rooms. When Kyoko wakes up, Yui handcuffs Kyoko's arm to the armchair in the hall, believing she was the killer at first. From their talk, Kyoko reveals that their vision was clouded by a smoke grenade, and what caused them to pass out seemed to have been something they ingested. While Kyoko tried to hold out and fake passing out, the culprit was prepared and knocked her out with a handkerchief laced with a knockout drug. Still, Kyoko was able to feel the culprit's hand and determine that it was male. Thus ruling out both herself and Yui.

Yet, Yui isn't fully convinced. With Kyoko's approval, she has Kyoko sit in the armchair and ties her other hand to the chair with one of Kyoko's ribbons. In turn, Yui was to investigate the facility in search of a uninvited sixth guest. Despite her initial search, it appeared as though there was nowhere else for this culprit to hide. Though its when Yui went to talk to Kyoko about the contents of the black letter she received, and assumed Kyoko had one as well, did both realize only Yui got the letter. Giving the challenge letter to Kyoko, the confined girl deduces that this murder case was a game. A game where Yui is the chosen opponent and Kyoko was to be the scapegoat of the murder.

Their topic moves on to Yui inspecting the corpses of the fallen detectives, and she discovers that not only were their heads cut off, but their body parts were chopped up evenly up as well and switched around with each other. In total, each body would have been chopped into 14 different parts. Kyoko deduces that they were chopped up for a specific reason - to make them easier to carry. When Kyoko asked for Yui to check the rooftop, Yui opens it up and uses her powerful legs to get up on top. Yet, no one was there. Back inside, Kyoko reasons that what made the group faint was that there were sleeping drugs in the canned coffee they drank (though Kyoko is doubtful about the driver being the culprit given they had just went down the mountain). Instead, Kyoko opts for another option: that the culprit was one of the allegedly dead men. Or rather, they used a body double to pretend to be dead.

The culprit selected a member of the Detective Library that looked just like them, killed them in advance at the observatory, and then posed as them to infiltrate the group before using said body in the dismemberment trick. However, (in addition to making it easier to carry the bodies) since liver mortis on their body double was a real risk to their impersonation trick, the culprit had to slice their double up and drain their blood to avoid that outcome. Naturally, they also had to chop up and do the same to the other two male detectives there in order for their body double to not be the odd one out. The culprit switched the body parts and did the dismemberment on the beds of the spare rooms to hide the fact that one of them was killed earlier, even pressing the switched body parts together to ensure no one would be able to spot the difference of one being drained earlier than the others.

On the topic of the culprit themselves, after Yui mistakes Kou as being the true culprit and hiding out in his alcohol filled suitcase, Kyoko redirects Yui to the telescope of the observatory. By using the reflective lens inside to make a secret compartment, the culprit placed the chopped up body of the body double inside the telescope. At least most of the body. The torso was hidden elsewhere, and that's where the culprit was hiding now. Kyoko grabs a bottle of alcohol from Kou's suitcase and pours it all over herself. With Eigo's lighter in hand, she threatens the culprit that she'll light herself, and by proxy the culprit, on fire if they didn't reveal themselves in a count of five.

In the end, the culprit surrenders and gives up. Inside the chair, was Shiita, or rather Shiita's doppleganger who had no legs and a knife in hand. Yui asks him who he is, to which he replies that his name is Tadashi Asakura.

Tadashi confesses that he killed the three detectives and lost the game (and by extension the money he would have won). He says that he sent five letters under the alias of Yoshizono Oe to five detectives to collect them in this place. He also adds that in Shiita's letter, he indicated the time of gathering a little earlier to call him in advance before he killed, dismembered, and hid him in the telescopes and the chair. He pretended all this time to be Shiita and did not let anyone go to the telescopes. Tadashi was surprised that a novice detective like Kyoko was able to defeat him and asked her when she first noticed that the armchair was his hiding spot. Kyoko says that the armchair was part of her analysis from the very beginning. Kyoko theorized that, since Yui would want to confine a murder suspect for the time being, she only had about two ways to really go about it: the table legs of the observatory (which Kyoko could have been able to slip out from) and the armchair Tadashi was hiding in. Once Kyoko would have been sitting there, if things didn't go Tadashi's way, he could have killed her with his knife. Kyoko is untied by Yui during this time.

With his loss, Tadashi decides to reveal what he knows about the Committee to the girls as payback against those who were watching this. He reveals that they scout out victims of serious crimes and offer them a chance to get revenge if they could sucessfully kill their Target without being discovered. In this case, Tadashi's target was Kou - the true culprit of the serial arson case that claimed Tadashi's family and his legs. Tadashi killed Shiita to use him as a body double and murdered Eigo to complete his murder trick. He had selected Kyoko to be his scapegoat since he figured a new detective wouldn't have the skills to be able to get themselves out of such a dire situation.

Tadashi calls for the organizers to end things since he knows he lost the game. Police would later storm into the building and arrest Tadashi, who gives one last hint for the girls. That a detective's DSC ranking is taken into account to determine who will be summoned for a Duel Noir. However, as the girls would quickly realize, those who took Tadashi were not the actual police. They were agents of the Committee who go on to kill Tadashi for his failure, and to get compensation for the Techniques used in the Duel Noir. The news would report his death as him dying in a fatal car crash off the mountain, and the police would rule it as an accident.

## Black Letter

Location: Sirius Observatory — 30 million yen

Weapon: Large shears — 5 million yen

Weapon: Fainting drugs — 5 million yen

Trick: Dismemberment — 80 million yen

Total Cost: 120 million yen

The Assigned Detective for this Duel Noir is Yui Samidare.

## Participants

### Host

**Tōkichirō Endō\***
 **Yoshizono Ōe\*** | -

### Detective Library

**Yui Samidare**

**Kyoko Kirigiri**

**Eigo Amino**

**Kou Inuzuka*****(Target)***

**Shiita Enbi**

## Results and Aftermath

* Yui Samidare and Kyoko Kirigiri become detective partners and eventually form a friendship.
* Finishing the Observatory Case, another Duel Noir was about to be hosted at Norman's Hotel, discovered by outside means of directly messaging Suisei Nanamura through the DSC.
* Tōkichirō Endō, although 'participated' indirectly, scouts and allures under orders to a parallel case in *Volume 7*.