Even a god, if it's alive, I can kill it.
— Ryougi Shiki
Written by Kinoko Nasunote and an official crossover with The Garden of Sinners.
Chaldea is alerted to an anomaly in 1990s' Japan where Servants have been mysteriously disappearing from the building and appearing in an apartment building in Mifune City. Eager to ensure that any more don't get abducted, the protagonist and Mash have been sent to investigate. Upon arrival, they meet a mysterious woman clad in a blue kimono, who also is investigating the spirits accruing inside the apartments. Together, they must scale the building and confront the culprit responsible for gathering unrestful souls and Heroic Spirits there.
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- All Just a Dream: The Singularity occurs in Shiki's dream/mind as the world has been incinerated by Solomon and she's in a deep sleep to avoid completely dying.
- Badass in Distress: Your Servants have been abducted by the Singularity and have been brainwashed in order to stay. It's your job to beat and save them.
- Brainwashed and Crazy: Some Servants, like Elisabeth, Boudica, and Fran, are no longer in the proper mental state to recognize the protagonist as their Master.
- Dark Is Not Evil: Despite Lancer Altria Alter's black armor and being an Alter, she's still sane and heroic. She only fight the protagonist group to make sure they can handle the higher floors.
- Debut Queue: Both variants of Ryougi Shiki made their debut, and the rerun introduces Fujino Asagami as an Archer.
- Death Is Cheap: You have to kill your servants to progress. However, since they are linked to Chaldea, they return there upon dying.
- Disc-One Final Boss: Evil Mephisto and his giant Ghost are treated narratively as the final bosses of the event, but by the time you face them, there's still well over half the building left to explore. Plus, Evil Mephisto says outright that he was not the one who summoned the building, merely that he took advantage of it to cause chaos.
- Descent into Addiction: Ann and Mary become addicted to the internet after Blackbeard teaches them to use it, and end up holed in their apartment with trash piled everywhere.
- Early-Bird Cameo: A mysterious Servant at the end, framed completely in shadow, turns up in a later event, revealing himself to be Edmond Dantes, who you deal with in the later event "Vengeful Demon's Wail at the Prison Tower."
- Foreshadowing: After meeting the mysterious servant in the Incinerator, Fou gets excited when the group meets three powerful ghosts who good Mephistopheles states are trying to become like "______ Murder". Fou being excited hints at his real identity.
- Gratuitous Japanese: In the English verison, When Okita entered the now-peaceful room formerly belonging to Nobunaga, she phrases her victory quote without it getting translated at all within the English texts: "Okita-san, DAISHOURI!"
- Lighter and Softer: The first half of the event is mostly serious with the corrupted servants revealing feelings that they're kept hidden such as Elisabeth's guilt and Boudica's rage. The second half's corrupted servants are silly things such as Fran being angry at Tesla wasting electricity so she's going to waste some as well.
- Literal Split Personalities: Mephistopheles appears as two distinct entities in this event, one being your main companion besides Shiki during the initial main quest, the other serving as the event's initial Arc Villain.
- Mythology Gag:
- The Rapunzel enemy is a reference to Kirie Fujou, the antagonist of the first movie, while the lesser Vengeful Spirit of Seven People enemy is based on the suicide victims whose deaths she orchestrated.
- The Living Corpse enemy being a Rider class may be a reference to a scene in the fifth movie
where they suffered a Curb-Stomp Battle at the hands of Shiki, who is an Assassin in Grand Order.
- Nice Job Breaking It, Hero: The mysterious Servant only made the apartment complex to give ghosts a place to stay. Unfortunately, Mephistopheles caught wind of it and decided to take advantage of the apartment complex to cause mayhem.
- Screw This, I'm Outta Here: Cynical of the dull accommodations provided by Chaldea, several of your Servants take Mephistopheles up on his offer of better housing only to be warped by the cursed apartment building.
- Split-Personality Takeover:
- The cast meets Hyde pretending to be Jekyll revealing that he's completely taken over due to the corruptive effects of the apartment.
- From time to time Saber Shiki will take control from normal Shiki to lend a hand. Normal Shiki never realizes when this happens.
- Take That Us: Boudica's rant toward the MC before her fight might be in response to how her character was written during Septem.
- Trailers Always Lie: The Trailer shows various Fate and Kara No Kyoukai casually interacting, including the Fate/Stay Night version of Illya. No Kara No Kyoukai outside of Shiki actually appears in the event, and it isn't until the Cosmos in the Lostbelt arc that the Stay Night version of Illya appears. There's also a shot of Mash, Diamud and Scathath fighting Caster Cu's Wicker Man, which also doesn't happen. The last shot of the trailer, Shiki fighting Saber Artoria in her final ascension is actually the event's Superboss.
- Why Did It Have to Be Snakes?: Leonidas at first looked like he's one of the victims of the tower, but turned out he's one of the saving party, only that he's scared shitless with ghosts and had to hole himself within his room and mistook the protagonist and Mash as ghosts.
