AI Collaborative World Building
Attack on Titan: The World Behind the Walls — Freedom, Titans, and the Truth Beyond the Sea
A complete world of dark military fantasy generated by AI from the canon of Attack on Titan — 29 atoms, a playable field AVG, character sprites, scene art, and an interactive studio. The world is not the end point, but the starting point of all creation.
For a century, humanity’s remnant lived inside three colossal walls — Maria, Rose, and Sina — told that the man-eating Titans outside were the end of the world. When the Colossal Titan breaks through Wall Maria, a boy swears to wipe every Titan from the earth, and the lie begins to crack. Freedom, in this world, exacts a price measured in blood, memory, and the hatred of nations.
A dark military fantasy of last-stand survival and buried history: soldiers of the Survey Corps risk everything beyond the walls with omni-directional mobility gear, chasing the dream of freedom while military and royal powers hide the truth. At the center stands Eren Yeager — rage against Titans, a bond with Mikasa Ackerman and Armin Arlert, and an inheritance of world-breaking power that drags Paradis Island into the wider cycle of Eldian and Marleyan hatred — toward the sea, the world beyond it, and a future where liberation and annihilation become hard to tell apart.
Visual style: semi-realistic, painterly strokes, game splash art, dark anime military atmosphere, towering stone walls, colossal silhouettes, muted earth tones, dramatic overcast light, brutal cinematic composition. Kimi K3 GPT Image 2
World cover — a lone soldier soars above the walls while a Titan silhouette looms beyond the shattered gate, generated by GPT Image 2 in 16:9
8 characters generated from the canon of Attack on Titan — soldiers, shifters, and survivors bound by oath, blood, and the dream of freedom. Each carries an independent backstory and a different answer to the same question: what would you sacrifice for the truth? The sprites below were auto-generated by GPT Image 2 with backgrounds removed.
Eren Yeager — the boy who swore to destroy every Titan
Mikasa Ackerman — the Ackerman prodigy
Armin Arlert — the strategist who dreams beyond the walls
Captain Levi — humanity’s strongest soldier
Mira Kessel — original Survey Corps scout of The Basement Truth
Characters
Eren Yeager
The boy who swore to destroy every Titan and became the fulcrum of the world’s buried war.
Characters
Mikasa Ackerman
The Ackerman prodigy whose unmatched combat skill is matched only by her devotion to Eren.
Characters
Armin Arlert
The strategist who dreams beyond the walls and later inherits the Colossal Titan’s burden.
Characters
Levi Ackerman
Humanity’s strongest soldier — short, immaculate, and unmatched with dual blades in midair.
Characters
Erwin Smith
The Survey Corps commander who gambles lives — including his own — for a glimpse of the truth.
Characters
Historia Reiss
The illegitimate royal heir who chooses to be queen rather than a forgotten sacrifice.
Characters
Reiner Braun
The Armored Titan warrior whose split identity is a wound as hard as his plating.
Characters
Zeke Yeager
The Beast Titan and royal-blooded brother who would end Eldian suffering by ending Eldians.
+Create More CharactersFrom the southernmost district of Shiganshina to the ocean that proved the cage was never the whole world, every location is a chapter of a buried history. The three walls are not just fortresses — they are the largest lie humanity ever told itself.
Shiganshina’s ruined streets after the breach — dust, ash, and a wall that never held
Night camp inside the walls — quiet dread before a mission beyond the gate
Beyond the Sea — the horizon that proved the island was never the whole world
Locations
Shiganshina District
The southernmost outer district on Wall Maria — and the door through which the old world ended.
Locations
Wall Maria
The outermost of the three walls — first line of defense, first to fall, and the edge of the known world.
Locations
Wall Rose
The middle wall that becomes humanity’s emergency frontier after Maria collapses.
Locations
Wall Sina
The innermost wall, seat of royal power, privilege, and the deepest lies.
Locations
Paradis Island
The island prison that Eldians of the walls mistook for the entire human world.
Locations
Beyond the Sea
The ocean and the nations past it — the truth that shatters the island’s century-old story.
+Create More LocationsFall of Wall Maria
The Colossal and Armored Titans shatter Shiganshina and open the outer wall to the horde.
Battle of Trost District
Humanity’s first counterattack after Maria — and the day Eren’s Titan power is revealed.
The Uprising and Coronation
The Survey Corps topples the false monarchy and seats Historia on the throne.
Return to Shiganshina
The battle to retake Wall Maria ends in victory, revelation, and devastating loss.
The Rumbling Begins
The Wall Titans march — Paradis’s final weapon unleashed upon the world.
Factions & Abilities (10)
Factions
Survey Corps
The scouting regiment that rides beyond the walls to buy humanity knowledge with lives.
Factions
Military Police Regiment
The inner-wall police force that guards order, privilege, and often corruption.
Factions
Marleyan Warriors
Eldian child soldiers of Marley who inherit Titans to fight their own kin on Paradis.
Factions
Royal Government of the Walls
The Reiss-centered power structure that rewrote memory to keep the island kneeling to peace.
Abilities
Titans
Giant humanoid predators — mindless hordes and intelligent shifters alike — that defined the age of fear.
Abilities
Titan Shifters
Humans who can transform into one of the Nine Titans and steer history with their napes.
Abilities
The Three Walls
Maria, Rose, and Sina — holy fortresses that were always sleeping Colossal Titans.
Abilities
Omni-Directional Mobility Gear
Gas-powered grapple gear that lets soldiers fly between buildings and strike a Titan’s nape.
Abilities
Paths and the Coordinate
The unseen realm connecting all Subjects of Ymir — and the Founding Titan’s throne of command.
Abilities
Cycle of Hatred
The generational loop of fear, revenge, and propaganda binding Eldia, Marley, and the world.
World Rules
The Walls
Three concentric fortresses — Maria, Rose, and Sina — built to cage humanity and, later, revealed as sleeping Colossal Titans.
The Nine Titans
Nine shifting powers inherited through generations; whoever holds the Founding Titan can command the Subjects of Ymir.
The Oath of the Survey Corps
To dedicate one’s heart to humanity and ride beyond the walls, where knowledge is bought with lives.
The Truth of the Basement
Beyond the walls lie the sea, the nations of Marley, and a century of lies that rewrote the island’s memory.
The Rumbling
The Wall Titans — humanity’s final weapon and the last argument of a cornered island.
Forty-one works have been generated from this world — 1 playable visual novel game, 5 character sprites, 6 scene backgrounds, and 29 atom covers. The game, Attack on Titan: The Basement Truth, is a field AVG set in Year 850: you are Scout Mira Kessel, marching with Eren, Mikasa, Armin, and Captain Levi to open the basement that rewrites a century of lies. The world is the source; works are its branches.
Attack on Titan: The Basement Truth — a playable field AVG: lead the squad to Shiganshina and face the truth hidden in the basement
Mikasa Ackerman · Neutral
Title key art — dusk over the ruined outer district
Ruined frontier town — ash and empty windows under the wall
Night camp — quiet dread before a mission
The Yeager house — abandoned but not empty of memory
The basement archive — journals, maps, and secret knowledge
Beyond the Sea — freedom and dread mixed at dawn
This world is public. You can Fork it — inherit all 29 atoms, every character, wall, and ability, rewrite what you want, and publish your own version.
Break a different wall. Follow a different scout. Send Paradis somewhere the map never shows. Swap the painterly military gloom for ink. The world is your asset library — rewriting is creation.
Collaborative workflow
Fork world → Edit atom cards → Generate new games/videos/assets → Publish → Others can Fork your version
World building · TextKimi K3Claude Opus 5
One sentence → 29 atoms: characters, locations, events, factions, and lore.
Art generation · ImageGPT Image 2BirefNet
Atom covers, character sprites (auto background-removed), scene backgrounds, and the 16:9 world cover.
In-game dialogue · Real-time narrativeDeepSeek V3Kimi K3
Real-time LLM writes the visual novel’s narrative in character voice; choices move Resolve, Trust, and Knowledge meters.
Music generation · AudioSuno
Somber military field music composed for the visual novel’s dread-laden atmosphere.
This is the actual studio workspace for the Attack on Titan world — the Board view with every atom card, the Gallery of generated art, and a character detail overlay. The world is not the end point, but the starting point of all creation.
In Neta Studio, a world is the beginning of everything. A world contains characters, locations, events, factions, and lore — all generated by AI from a single sentence, all referenceable, rewritable, and expandable.
A world is not a game, a video or an image. A world is the source of all of these: from the same world, you can generate visual novel games, character sprites, scene backgrounds, and music — each inheriting the same worldview, the same walls, the same question of what freedom is worth.
World → Game
Select a storyline from world cards, AI auto-writes game logic, generates art, builds a playable field AVG like The Basement Truth.
World → Video
Generate dynamic videos from world characters and scenes — title animations, character entrances, Titan reveals.
World → Assets
Each character auto-generates a sprite, each location auto-generates a background. The world itself is an asset library.
Create from This World
Inherit 29 atoms, rewrite what you want, create your own truth beyond the walls.
World: Attack on TitanType: Anime World · Dark Military FantasyAtoms: 29 (Characters 8 · Locations 6 · Events 5 · Factions 4 · Abilities 6)Works: 41 (Game 1 · Sprites 5 · Backgrounds 6 · Covers 29)Assets: 4 (Cover 1 · Studio 3)
