Setting ''.|225x225px The
Splatoon series takes place 12,000 years into the far future on a post-apocalyptic Earth following the extinction of humans and virtually all other mammal life, implied to be the result of rampant
climate change. After this cataclysm, the planet is repopulated with evolved marine animals who become terrestrial creatures and in the present day reside in the regions of Inkadia and the Splatlands. Such creatures include the Inklings and Octolings, humanoid
squids and
octopuses respectively, whom players take control of. The hub worlds of
Splatoon and
Splatoon 2, Inkopolis Plaza and Inkopolis Square respectively, are located in Inkadia within the greater city of Inkopolis, while the hub world of
Splatoon 3, the city of Splatsville, is situated in the Splatlands. During the events of
Splatoon 2: Octo Expansion, Pearl and Marina remotely assisted Agent 8 in escaping the Deepsea Metro, a network of subterranean
rapid transit facilities owned by the Kamabo Corporation, ran by Commander Tartar. Kamabo's primary activities consisted of kidnapping Octarians, the overarching group of which Octolings are a part, and subjecting them to rigorous experimental tests. The best-performing test subjects would be killed, with their bodies blended into a fluorescent green paste. This paste, when doused onto other creatures, caused them to lose their memories and free will, ultimately becoming subservient to Kamabo in an act known as "sanitization". Kamabo's ultimate goal was to create an apex species, loyal to the company's ideals, in an attempt to instigate a world of pure harmony and non-conflict. Prior to
Octo Expansion, Acht, a friend of Marina when the two served in the Octarian military, willingly partook in sanitization to devote themselves solely to music production under the pseudonym Dedf1sh.
Plot A news report from
Deep Cut details strange phenomena occurring in Inkopolis Square, the hub world for
Splatoon 2, with some inhabitants appearing to stand mindlessly. They then announce a train line opening between
Splatoon 3s hub world, Splatsville, and Inkopolis Square. While on the train, the player's
Splatoon 3 avatar falls asleep as a
glitch effect takes over the screen, turning the train into an empty and bleak version of Inkopolis Square. The game shifts control to Agent 8. They awaken in a
virtual world called the Memverse, where they are found by
Pearl—who is now a drone—of the pop music duo Off the Hook. Agent 8 and Pearl enter the Spire of Order to find the latter's co-star Marina, who has vanished. In the elevator, they find Acht, a formerly "sanitized" Octoling and a childhood friend of Marina, who teaches them how to combat Jelletons,
x-ray fish-like enemies. Upon reaching floor 10, they find Marina held captive and controlled by Order, an
artificial intelligence formed out of wishes for an orderly world by people who have interacted with the Memverse. After freeing Marina, Order ejects the group and significantly increases the height of the Spire and the difficulty of its challenges. Pearl is reverted to her bodily form, and can now willingly switch into a drone. Marina explains to Agent 8, Pearl, and Acht that she originally created the Memverse to recover the memories of sanitized Octolings taken prisoner by Kamabo Corporation. Order then hijacked the Memverse to create a reality of "perfect order" by luring citizens within and erasing their free will via "grayscaling", which causes them to enter a mindless state in the real world. The group comes across a locker containing twelve Palettes that Agent 8 can equip to ascend the Spire. Each Palette corresponds to the memories of someone from the real world, but contain errors—Marina explains that reaching the top of the Spire will allow the chosen Palette to be reconfigured, and completing boss fights with a new Palette awards keys, allowing Agent 8 to unlock more Palettes. The group reaches the top of the Spire to challenge Order, who transforms into a gargantuan octopus form. Nearing defeat, Order attempts to grayscale all of the real world's inhabitants, but the group survives the attack and defeats it using Pearl's "Color Wail" weapon. Order is reduced to an infantile form known as Smollusk and stripped of its influence over the outside world; the group leaves the Memverse and returns to the real world. The player's
Splatoon 3 avatar then awakens upon arriving at Inkopolis Square. Deep Cut reports that most of the Inklings and Octolings have regained their energy and the Square has largely returned to normal, though a select few still appear to stand idly. Upon returning to the Memverse, Agent 8 is tasked by Marina with ascending through the Spire and defeating Smollusk (who remains at the top floor) with each of the twelve Palettes, stating that it is necessary to reconfigure all of them to avoid complications with each Palette's real-world counterpart. Upon defeating Smollusk with the final Palette, it admits that it is worried about being left alone forever now that the group's mission is complete. Marina states that it will still be necessary for the sanitized Octolings to reach the top of the Spire as part of their recovery, and that Agent 8 can come visit the Spire whenever they want, promising that Smollusk will never be left alone for long. == Development and release ==