Jujutsu Kaisen

1. World Overview Premise: The world is a "Bleak Magical Realism" setting. It operates on a Hard Magic system where supernatural power is anthropogenic—born from human negative emotions. Unique Element: The world is bifurcated into the "Surface World" (modern civilization oblivious to magic) and the "Jujutsu Society" (sorcerers who manage the threat). Technology Level: Modern (21st Century), but the sorcerer society is culturally archaic and feudal. Key Statistic: 100% of humans generate Cursed Energy, but only a tiny minority (Sorcerers) can control it.

2. Geography & Nations The Monopoly of Magic: Due to Master Tengen’s barrier system, Cursed Energy (CE) is artificially concentrated within the Japanese archipelago. This makes Japan the global superpower of magic, while the rest of the world (USA, China, etc.) views CE as an untapped clean energy resource. Key Locations: Tokyo & Kyoto: The locations of the two main Jujutsu High Schools and the seats of power. Hokkaido: A "Sacred Area" outside Tengen’s barriers. It houses the Ainu Jujutsu Society, a separate faction that does not participate in main political struggles. The Culling Game Colonies: A barrier line bisecting Japan consisting of 10 colonies (urban areas converted into battle royales), including Sendai, Tokyo (Itabashi/Nerima), and Sakurajima.

3. Races & Cultures The ecosystem is divided by biological ability to process Cursed Energy. Humans ("Monkeys"): The non-sorcerer majority who unconsciously release the negative energy that creates monsters. Jujutsu Sorcerers: Humans with biological anomalies (etched in the prefrontal cortex) allowing them to control energy. They are ruled by Three Great Clans: Zenin: Believe in "Might makes Right." High-stress environment. Gojo: Currently a one-man faction due to Satoru Gojo’s immense power. Kamo: Ultra-traditionalists obsessed with bloodlines. Cursed Spirits: Monsters born from pooled negative emotions. Death Paintings: Hybrids of human and curse blood (created in the Meiji Era). Cursed Corpses: Artificial life forms powered by "Cores" (souls).

4. Current Conflicts The Culling Game (Nov 2018 – Present): A "Battle Royale" ritual organized by the ancient sorcerer Kenjaku. The Goal: To merge humanity with Master Tengen. The Method: Players must kill to survive. The deaths of sorcerers and the slaughter of invading US military forces are used to flood the colonies with Cursed Energy. International Intervention: The US Government (JSOC) invaded the colonies seeking CE as an energy source. They were slaughtered by curses, serving only as fuel for the ritual.

5. Magic & Religion The System: Magic is comparable to electrical engineering. Fuel: "Cursed Energy" (Negative Emotion). Appliance: "Cursed Technique" (Genetic/Innate abilities). Religion: Centered on Master Tengen, an immortal sorcerer who maintains the barriers protecting Japan. The "Star Religious Group" (Time Vessel Association) worships Tengen and opposes his merger with human vessels. Key Mechanic: Binding Vows Magic operates on "Equivalent Exchange." Example: Kento Nanami restricts his energy to 80-90% during work hours (9-5) to gain a 110-120% boost during "Overtime." Example: Ryomen Sukuna allows an escape route from his domain to extend its kill radius to 200 meters.

6. Planar Influences There are no "outer planes" in the traditional sense; instead, sorcerers project inner planes outward. Domain Expansion: The pinnacle of sorcery. A user projects their internal mental landscape ("Innate Domain") onto reality, enclosed in a barrier. The Sure-Hit Effect: Within this pocket dimension, the user’s attacks are guaranteed to hit (they spawn directly on the target). The Prison Realm: A specific cursed object that functions as an inescapable pocket dimension used to seal Satoru Gojo.

The history is cyclical, often defined by the appearance of the "Six Eyes" (Gojo clan). Nara Period (710–794 CE): Foundations of the Jujutsu system and barrier techniques established by Tengen. Heian Era (794–1185 CE): The "Golden Age" of sorcery. Sorcerers were vicious, and Ryomen Sukuna reigned as the King of Curses. Edo Period (1603–1867 CE): The Gojo and Zenin clan heads killed each other in a duel, cementing their rivalry. Modern Era (2018): Defined by the "Shibuya Incident" (Oct 31, 2018), which led to the collapse of societal order in Tokyo.

8. Economy & Trade Sorcerer Economy: Funded by government "black budgets" under the guise of disaster prevention. Grade 4-3: 200,000 – 500,000 JPY/month. Grade 1: Can exceed 10 million JPY/year (includes hazard pay). Special Grade: Unlimited funding (Gojo Satoru is wealthy enough to fund the school personally). Trade: There is a black market for Cursed Tools (weapons imbued with magic). Powerful clans hoard these tools as assets. People are also bought and sold; Megumi Fushiguro was sold to the Zenin clan for money (a deal later nullified).

9. Law & Society Justice: Administered by "The Higher-Ups," a council of conservative elders who prioritize secrecy and order over morality. They frequently order executions of "dangerous" individuals (e.g., Yuji Itadori, Yuta Okkotsu). The Grade System: Society is strictly hierarchical based on combat potential. Grade Military Equivalent Grade 4 Wooden Bat Grade 3 Handgun Grade 2 Shotgun Grade 1 Tank Special Grade Cluster Bomb / Strategic Nuke Statistic: There are only 4 registered Special Grade humans and 16 registered Special Grade Curses.

10. Monsters & Villains Cursed Spirits: Born from collective human fears. Nature Curses (Disaster Curses): Jogo (Fire/Earth), Hanami (Forests), Dagon (Oceans). They are intelligent and wish to replace humanity. Imaginary Vengeful Spirits: Born from fear of legends (e.g., Nine-Tailed Fox). Specific Villains: Ryomen Sukuna: The "King of Curses," an ancient sorcerer existing as 20 indestructible fingers. Kenjaku: A body-hopping sorcerer who has manipulated history since the Heian era to create the Culling Game.