Shinjuku Inferno

Shinjuku Inferno (新宿インフェルノ Shinjuku Inferuno), is a catastrophic, potentially world-ending event triggered by the clash between Jupitermon: Wrath Mode and the Giant Slayer that resets the timeline. The term is coined by Yuki Dan/Yuki Kanan.

Appearances

Video Games

Digimon Story: Time Stranger

In the past, Chronomon started a rebellion against Homeostasis. His soldiers were defeated easily and he was sealed inside the Akashic Records. To free himself from suffering, he created Aegiomon's Digitama in hopes of the resulting Digimon killing him, preferably if Aegiomon becomes as broken as him when he does so.

To this means, Chronomon instigated a series of complicated events purposefully orchestrated to maximize suffering. The key events that lead to the Shinjuku Inferno are as follows:

• Chronomon created a legend about himself sacrificing his own life to protect Iliad from the Titans to provoke them into a rage trying to take over it;
• Aegiomon's egg is thrown into the human world, eventually resulting in a clash between him and Titamon in front of the Shinjuku Government Building. This results in Aegiomon obtaining time powers and a large Digital gate endlessly summoning Digimon into the human world;
• All of Iliad's guardians are rendered dead or incompetent by exploiting their personality flaws (this ensures nobody is left to keep Aegiomon's impulses in check); notably, compromising and possessing Junomon was integral to Chronomon's plan, as she is the only one who can directly send masses of Digimon into the human world. He also drove a wedge between Apollomon and Dianamon through a Pumpmon posing as liason so Dianamon can be manipulated into doing the dirty work for Junomon.
• The minds of some humans working for public security (such as Kuroi Shota) are poisoned into genocidal hatred against Digimon through Ranamon assassinating Kuremi Kodai, prodding them into trying to contain all Digimon inside the Wall of Hope and building the Giant Slayer in hopes of killing every Digimon inside the wall at once.

The sheer devastation unleashed against the Digital World results in more Digimon appearing inside the human world, where they will be facing the genocidal hatred of D-SAT, ignoring that the general public is fine with Digimon appearing in their daily lives. Eventually, this results in a three-way war between Titans, humans and remnants of Rebellion Village, starting with massive, deadly Titans pouring out through Digital Gates created by Junomon trying to take over the human world and will engage in combat with Mercurymon's forces, coming out victorious as Mercurymon sacrificed himself to save his comrades back in Iliad. Out of desperation, D-SAT will activate the Giant Slayer trying to kill all Digimon only for Chronomon to take over the machine and eject its pilot Kuroi off its cockpit, then use it to attack Aegiomon's human partner, Misono Inori. This inevitably results in Aegiomon (as Jupitermon: Wrath Mode) destroying the Giant Slayer out of rage and subsequently destroying the entire world with the collision, resetting the timeline. In other versions of the event, Inori will be sealed within a space-time rift following the collision, and Aegiomon Dark Evolves into Aegiochusmon: Dark attempting to save her through time travel only to distort the timeline and leave shadow copies of himself in his wake. The situation went so bad that it became an outright threat against world order, so Homeostasis decided to intervene and creates Yuki Dan/Yuki Kanan out from an Aegiomon shadow that he created during one of his many attempts to jump across time to save Inori, so the loop can be broken.

The events leading to the Shinjuku Inferno cannot be stopped before it fully forms, nor can it be interrupted or hindered by saving individual Apostles as Chronomon is already finalizing the loop when the party is saving the Apostles of Iliad. The only way to break the loop is for Yuki to save and recruit all eleven apostles of Iliad for Aegiomon. Saving only some of the Apostles of Iliad, but not all of them seems to merely force significantly larger and more dangerous Digimon out, with more massive Digimon such as Armagemon and Ultimate Brachimon appearing within the Wall of Hope. Despite not being an Apostle of Iliad, Plutomon, the leader of the Titans, is also integral to world balance and must be saved alongside them. Furthermore, according to Mikagura Mirei, the Shinjuku Inferno must be allowed to happen for Misono Inori to be saved.

The loop was broken at last when the protagonist manages to use their time-traveling abilities inherited from Aegiomon to save all eleven apostles from ruin and fuse back with Aegiomon into Jupitermon as the twelveth apostle, forming the Olympos XII. Apollomon and Dianamon was able to fuse into Grace Novamon and contain both Jupitermon: Wrath Mode and the Giant Slayer in a seperate dimension, putting the Shinjuku Inferno under control. The protagonist and Aegiomon manages to defeat the Giant Slayer, save Inori and transport many Digimon alongside themselves into the Akashic Records for the final battle against Chronomon.

Alternate Dimension

Mirei states that Parallelmon gained power following the Shinjuku Inferno, allowing it to use the Akashic Backdoor to walk through realities and timelines to search for prey.

In the timeline of the first DLC episode, an alternate version of Kuremi Kyoko and Kuremi Kodai hailed from an alternate timeline where instead of resetting the timeline, the Shinjuku Inferno destroyed civilization and eradicated all hope from the survivors. According to Kyoko, most people simply waited for their doom and some of them even used their favorite shows back when the world was peaceful to escape from reality.