- Background Music: "Ark" and "Improvised Song Dedicated to the next Prime Minister’s Ship"
- Available: November 24
- Deadline: December 18 (Election Day)
- Owner: Masayoshi Shido
- Location: Diet Building (All of Japan)
- Keyword: Ship
A world within the Metaverse created by Masayoshi Shido. The Phantom Thieves of Hearts plan a heist to steal Masayoshi's heart in order to reform him before he can be elected as Japan's next Prime Minister and instill his radical policies. The dungeon takes the form of a luxury cruise ship with the sitting atop. The boat floats in a massive sea that engulfs all of Japan. The skyscrapers in the immediate vicinity of the building float half submerged in the water, occasionally being crushed by the oncoming vessel. The Thieves comment that Shido does not really care about the future of the country as he claims in reality but only wants to save himself and his wealthy patrons on an ark.
The team finds that they require five letters of introduction to access the Representative Chamber where Shido's Treasure lies within. These letters are held by Shido's most trusted allies within the Conspiracy who appeared in the hotel where the protagonist, Morgana, Ryuji and Ann celebrated their first victory as Phantom Thieves. After the defeat of the first of them, it becomes apparent that the VIPs aboard the ship are not those of Cognitive existences, but rather direct manifestations of the person's Shadow Self, able to appear due to their powerful bond with Shido.
Each of the VIPs also reveals their part of their scheme within the Conspiracy. Politician Ooe explains the subway train pilot rampages are attempts to remove the previous Minister of Transport from office while Shido critizing his mismanagement. TV Station President reveals that Junya Kaneshiro has donated a large sum of money to Shido profited from Ichiryusai Madarame's artworks, this explains Kaneshiro's impunity before his reformation. IT Company President played Medjed because they already know the Phantom Thieves cannot target anonym and their original plan is to admit defeat on the day of Cleanse to boost the popularity of the thieves to a new height. Futaba Sakura's hacking into the imposter's Medjed website is a miscalculation which they did not care much. He is also responsible of encrypting Wakaba Isshiki's research on the world of cognition and uploading it to a secret domain before they destroy it. Like Kunikazu Okumura, all of these connections have donated money to or cooperated with Shido for assassinations by mental shutdown of their competitors.
Shido's Treasure is his legislator's pin which takes the shape of a golden helm's wheel floating above the ship. This is reflective of his warped view that he is the only person who can "steer Japan" in the right direction. After the defeat of his Shadow Self, real Masayoshi Shido takes a medicine to enter suspended animation in order to kill the Phantom Thieves and prevent the Treasure from being stolen. But the Phantom Thieves escape in time and Shido begins to repent his actions. The pin itself, however, isn't valuable at all so the Thieves can't sell it.
List of Enemies
- King Frost
- Kurama Tengu
- Emperor's Amulet
- Yamata no Orochi (Politician Ooe)
- Forneus (Former )
- Hanuman (TV Station President, accompanied by Garudas)
- Oberon (IT Company President, accompanied by Titanias)
- Ongyo-Ki (Yakuza cleaner)
- A neon sign on the side of the ship has the words "The arc of elite."
- The submerged city symbolizes both the progressively rising sea level because of climate change and the economic state of Japan which is still struggling to recover from the burst of asset price bubble in 1992.
- Shido's Palace is the second cruise dungeon in the series after Nichirinmaru from Persona 2: Eternal Punishment which also happens to be the headquarter of the conspiracy.
- Shido's Palace is likely a Noah's Ark reference. It is a cruise where the rest of the world is flooded and the background music is "Ark."
- Shido's Palace is based on the scene of 2013 movie White House Down where Martin Walker was the collaborator of the conspiracy
- The ship's design, aside from The Diet Building at the front of the superstructure, is clearly based on the RMS Queen Mary 2 luxury ocean liner.