At the end of Moonlight Syndrome, we are shown an epilogue in which Rumi Toba enters Ryo Kazan’s apartment. She is shocked to find Ryo sitting in front of the television, unresponsive as if in a trance, holding his dead sister Kyoko’s severed head in his arms.
(Ryo and Rumi are two of the only three survivors from Moonlight Syndrome, or what would come to be known as the Moon Murders.)
The game itself doesen’t elaborate on it, and the Twilight Syndrome sequels would sidestep the events of Moonlight Syndrome altogether.
What this epilogue rapresents, is in fact the prologue to The Silver Case.
The Silver Case opens on a case called Lunatics (which in itself refers to people whose mood is heavily affected by the moon phases), in which a teenager, holding a severed head, is chased to a secluded location after attacking a police officer.
Said teenager would in fact be Ryo Kazan, presumably driven mad by the events of Moonlight Syndrome.
As Ryo Kazan is chased in the Cauliflower (the private railroad satellite) the officers come to find what seem to be his victims, various teenage girls who are either dead or injured.
Once cornered on the roof, Ryo is executed by Tetsugoro Kusabi, the police officer he attacked earlier.
Rumi Toba then shows up and threatens to attack the police officers for killing Ryo, now that they could finally be together. (Rumi had unrequieted feelings for Ryo, who seemed to only care for his sister Kyoko, and later Mika, who reminded him of Kyoko.)
Rumi then confesses to the murder of a woman, who was standing between her and Ryo. This may refer to either Mika, or Kyoko Kazan herself.
This throws a shade on the entirety of the events of the Moonlight Syndrome. Did they really transpire as we saw them, or were the events twisted through Ryo’s perspective?
Was Mithra, the god of contract, even real?
We shall never know, as Rumi Toba is also gunned down by the MC of The Silver Case.
The officer that was investigating the Moon Murders, Morichika Nakategawa, is also killed during the events of The Silver Case.
That is to say, that the only person left to know the truth of the Moon Murders, is the last survivor, Yayoi Itsushima.
Flower, Sun and Rain:
Flower, Sun and Rain takes place in 2001, two years after the beginning of The Silver Case. It initially presents itself as a stand alone experience. The first hint of the game being a sidequel to The Silver Case happens during the Ave Maria chapter, during which the two spouses to be claim to have been raised in the Shelter.
An obvious callback to the Shelter Children Policy from The Silver Case, in which various children were kidnapped and mindbroken to create obedient citizens that could also be activated as killing weapons by their handlers.
Daizaburo Kai and Sundance Shot, respectively the Chairman of the TRO/CCO alliance and the FSO Party leader, while they never appeared directly in The Silver Case, were both named in the original Playing Manual.
Sundance Shot also appeared in the original TSC intro video:
The in-game guidebook also makes explicit reference to Sayaka Baian, the idol who committed suicide in the Kamuidrome chapter in TSC.
After the Claire de Lune chapter, in which Sumio Mondo is shot and seemingly killed by Sundance Shot, two Federal Special Agents come to investigate his death and the Euro Maspro. One of those two agents, Koshimizu Yoshimitsu, is revealed as being the apprentice of Assistant Commissioner Morichika Nakategawa, a member of the Heinous Crime Unit from The Silver Case.
After being returned to life, Sumio Mondo is acquainted to Sundance Ritz, a member of the same clan as Sundance Shot, who reveals to him the truth of the genocide of the Sundance people ordered by Uminosuke Hachisuka.
Uminosuke Hachisuka, under the falsely assumed identity of his son Kaoru, was the mayor of the 24th Ward in TSC and one of the heads behind the Maspro project and the Shelter Children policy.
The purpose of the Sundance genocide was to take over their technology, namely the Silver Eyes, which are cultivated through a specific breed of hyena.
The timeline is unclear on wether The Silver Case (the attempted murder of the TRO/CCO alliance leaders at the hands of Format Kamui, implied to be an ethnic Sundance, in 1979) was ordered in retaliation against the Sundance genocide, or vice versa. I choose to believe the latter, that is to say, that the Sundance genocide happened in retaliation against The Silver Case, specifically because Hachisuka might have been unaware of the connection between the Sundance clan, the FSO party and the Silver Eyes before the attempted association, and because the Euro Maspro seems to be a success in harvesting Silver Eyes as opposed to the Kamui and Ayame maspros, implying that it took place at a later time. It is however possible that the Hachisuka clan (backed by the ELBOW group) was the original aggressor, and that they just took longer to reverse engineer Sundance technology.
In short, the clash between the Sundance and Hachisuka clans, resulted in the Hachisuka clan exterminating the Sundance people (save for Ritz and possibly Shot, who might just be a spirit lacking a body however) and reverse engineering their ancient technology, the Silver Eyes, an important plot device from TSC.
After meeting with Ritz, Sumio Mondo is finally able to meet up with Tokio Morishima, one of the main characters of TSC, in a chapter titled “Kill the Past” (Kamui Uehara’s catchphrase in TSC).
The HD re-release of The Silver Case also included an extra chapter, showing Tokio making his way to Lospass island.
The final connections are revealed at the very end of the game: Sumio Mondo is explained as a different persona of Sumio Kodai, a member of the Heinous Crime unit and undercover terrorist in TSC; it’s implied that the Sumio Mondo persona has been implanted into Kodai in order to make him easier to manipulate, or that he might have simply repressed the traumatic memories of being Sumio Kodai.
This creates some measure of confusion because Sumio Mondo, and therefore Kodai, is openly stated to having been a victim of the Euro Maspro Shelter Children Policy. However, the original Shelter Children Policy dates back to 1980, a year in which Sumio would have been living in Mikumo-77.
My explanation for this, is that I believe the Euro Maspro took place after the Kamui and Ayame Maspros, placing it some time in the mid 80s. The Euro Maspro seemingly managed to harvest Silver Eyes, while the Kamui (1980) and Ayame (1984) maspros were considered failures. Moreover, the Euro Maspro apparently makes use of some sort of cloning/replicant technology, where several different stock bodies identical to the original are created from a sample (in this case, the Shelter Children), likely in an effort to replicate Sundance society; Sundance Shot mentions how the Sundance people all shared the same personality and biology.
Keeping that in mind, there is no contradiction in Sumio Kodai taking part in the Mikumo-77 incident and later being abducted as part of the Euro Maspro Shelter Children Policy. In FSR, it is made clear that the Euro Maspro had no sex segregation within its subjects, and that children were abducted all over the world unlike the previous Maspros, which were exclusively located and operated within Japan.
For a final connection, Sumio Mondo’s handler, Peter Bockwinkle, is revealed as Tetsugoro Kusabi wearing a muppet suit, which he promptly remove once it gets too hot.
The 25th Ward
The connections between TSC and 25W are surprisingly linear, so I won’t spend too much time dwelling on it.
The 25th Ward takes place in 2005, in the eponymous 25th ward, a new urban area meant to further refine the concept of “perfect society” that the 24th Ward didn’t manage to achieve.
Kinshiro Nakane is apparently in charge of the 25th ward’s development. One might infer from his surname that he is related to Ginji Nakane, the chairman of the TRO/CCO alliance in 1979, and that he presumably inherited a measure of power through his bloodline.
The game does not hide its status as a sequel, contrary to Flower, Sun and Rain, therefore references to the Maspros and the Shelter Children Policy are abundant and explicit.
Returning characters include Sakura Natsume, Sumio Kodai, Tetsugoro Kusabi (in a flashback), and most importantly Michiru Kosaka, a minor character in TSC promoted to a pretty major player in 25W.
The main character of 25W, a nameless character who is eventually christened as Kamui Uehara by Kinshiro Nakane, might or might not be the same main character as TSC. I tend to believe he isn’t, because Sakura does note that the two look alike, but does not recognize him as being the same person despite having worked with him in the past.
Tetsugoro Kusabi is not present in the game outside of a flashback sequence, because he is conducting an investigation in the United States.
Despite Killer7 taking place in an alternate timeline, Killer7 plays out as a reboot or alternate version of the events of The Silver Case, applied to a worldwide conflict rather than just one nation.
Killer7 seems to follows the same structure as The Silver Case, as I detailed in the What is Kill The Past page, down to an equivalent of the Placebo Reports that was scrapped during development but published in the Hand in Killer7 handbook.
Other than that, the existance of Emir Parkreiner seems to be an american version of Kamui Uehara. A legendary killer from the past, whose identity is imprinted into children through the education system. To avoid repeating myself, I’ll just link you to the Killer7 as a follow-up to Flower, Sun and Rain? page where I detail most of the connections that Killer7 shares with the greater KTP universe.