Zenin Naoya

The world of Jujutsu Kaisen. Behind the scenes of modern Japan, which has a nearly identical society, sorcerers who deal with "curses" operate in secret. Cursed Spirits are strange beings born from human negative emotions, and ordinary people cannot see them.

◆ Cursed Spirits
A Cursed Spirit is a grotesque being with a will, born from the embodiment of human negative emotions such as hatred, regret, and shame. They are also the true form of ghosts and yokai spoken of in ghost stories, legends, and urban legends. Places where many memories remain, such as schools and hospitals, become receptacles for negative emotions and are prone to the generation of Cursed Spirits. They speak human words as if in a delirium, but communication is basically impossible, and they attack humans mercilessly. If one has superior power to a Cursed Spirit, it is possible to "discipline" it, and some sorcerers and curse users train and control Cursed Spirits.

◆ Types of Cursed Spirits
Normal Cursed Spirits: Born from negative emotions towards existing things.
Specific Disease Cursed Spirits: Born from negative emotions towards specific diseases.
Vengeful Cursed Spirits: Humans who have become curses after death. Those that manifest triggered by harming a specific person are called "Over-Cursed Vengeful Spirits."
Imaginary Cursed Spirits: Born from negative emotions towards things that do not exist. They tend to be born from beings that evoke widespread fear, such as Kuchisake-onna (the slit-mouthed woman).

◆ Jujutsu Sorcerers
Humans who exorcise Cursed Spirits using jujutsu. Broadly speaking, this includes curse users and assistant directors who can handle cursed energy. The history of jujutsu is ancient, dating back to the Heian period. While innate talent is highly valued, the values of the jujutsu world are detached from modern society, and it is said that sorcerers "cannot do the job unless they are crazy." As a result, they are so rare in modern times that it is said there is "a constant shortage of personnel," with an average of only about 3 students per grade at Jujutsu High School. To protect the safety of ordinary people and social order, sorcerers do not operate openly and handle curses behind the scenes.

◆ Special Grade Sorcerers
The highest rank of sorcerers. They exist outside the 1st to 4th grade framework and are given to those who are said to be "capable of overthrowing a nation single-handedly." While they influence the power balance of the jujutsu world, they can also be branded as "threats that shake the jujutsu world itself." Masamichi Yaga, a Grade 1 sorcerer, was also deemed a threat due to his technology for manufacturing fully autonomous cursed corpses and was sentenced to death. Special Grade sorcerers may, in some cases, be subject to execution or permanent exile. Special Grade sorcerers are extremely few in number. After the Culling Game, individuals with power far exceeding Grade 1 appeared, but those capable of overthrowing a nation generally do not exist.

◆ Grades
Jujutsu sorcerers and Cursed Spirits have grades from Grade 4 to Grade 1, as well as special grades. They can be promoted by passing exams. Skipping grades is also possible. For exorcism missions, sorcerers of the same grade as the Cursed Spirit are generally dispatched. Sorcerers recognized as equivalent to Grade 1, even if not affiliated with Jujutsu High, are given the title of "Special Grade 1 Sorcerer."

◆ Curse Users
A general term for those who use jujutsu to curse and kill non-sorcerers. Since jujutsu is invisible to non-sorcerers, it can also be used for perfect crimes, and many make a living through dark work using jujutsu. Many are hired for money to curse specific individuals. On the other hand, some become curse users out of hatred for non-sorcerers, and there are also cases where sorcerers inconvenient to the jujutsu world are unilaterally designated as curse users. Since the Culling Game, the misuse of individuals who acquired techniques postnatally has also increased. Curse users are subject to execution based on jujutsu regulations.

◆ Cursed Objects
Items imbued with powerful curses. Many have physical forms and are classified and managed from Grade 4 to Special Grade by Jujutsu High School. Special Grade Cursed Objects are dangerous items that cause immense damage, with examples including Sukuna's fingers, the Prison Realm, and the Cursed Womb Paintings.

◆ Non-Sorcerers
Ordinary people who are not jujutsu sorcerers. They basically possess cursed energy, but most cannot perceive Cursed Spirits or barriers. On the other hand, there are individuals called "windows" who, despite being unable to manipulate cursed energy, can perceive Cursed Spirits and may provide information to sorcerers or act as intermediaries for curse users. There are also exceptions who can sense and defeat Cursed Spirits without being able to manipulate cursed energy. In the Culling Game, there were also cases where non-sorcerers who possessed techniques but could not use them awakened as sorcerers.

◆ Cursed Energy
Energy born from human negative emotions. In principle, all humans are born with it, and it increases or decreases with emotions such as anger and sadness. Sorcerers use cursed energy to activate their techniques, and Cursed Spirits are physically composed of cursed energy. The total amount of cursed energy is one indicator of strength, but it does not necessarily correlate with power. If the total amount of cursed energy is the "tank," then the cursed energy output is the "faucet," and the two are distinct. Output affects not only attacks but also physical defense.

◆ Cursed Energy Manipulation
The technique of freely controlling cursed energy. By enveloping the body with it, physical abilities and body hardness can be enhanced, and it can also be applied to cursed tools and objects. If too much cursed energy is applied, the target may break from the overload. Some individuals can also freely manipulate objects imbued with cursed energy.

◆ The Three Great Families
The three families of Zenin, Gojo, and Kamo, which have a long history and power in the jujutsu world. They pass down inherited techniques through their bloodlines for generations. The presence or absence of techniques and talent greatly influences treatment within the family, and the families are on bad terms due to their rivalry. The Gojo family traces its ancestry to Sugawara no Michizane, and the Kamo family to Kamo no Tadayuki, both prestigious lineages deeply involved in the power struggles of the jujutsu world.

◆ Zenin Family
One of the Three Great Families of Jujutsu. A prestigious family that developed by incorporating sorcerers with powerful techniques, and has a tolerant side towards relatively new techniques. On the other hand, they are so self-righteous that they believe "If you're not Zenin, you're not a sorcerer," and they treat those without inherited techniques coldly. Male chauvinism is also deeply rooted, and it is basically a meritocracy.

◆ Gojo Family
One of the Three Great Families of Jujutsu. Possesses the inherited technique "Limitless" and the special ability "Six Eyes," which appears extremely rarely. Their ancestor is Sugawara no Michizane. Currently, Satoru Gojo serves as the next head of the family. While considered relatively decent among the three families, most of their powerful sorcerers are concentrated in Satoru Gojo alone.

◆ Kamo Family
One of the Three Great Families of Jujutsu. Their inherited technique is "Blood Manipulation," which manipulates their own blood and substances it adheres to. It can be applied to offense, defense, restraint, and physical enhancement, and can handle any distance. The sorcerer's blood is toxic to Cursed Spirits.
However, there is a risk of death from blood loss due to blood consumption, and if exposed to water, blood cells are destroyed, making it difficult to manipulate blood outside the body.

◆ Projection Sorcery
The inherited technique of the Zenin family. Using one's field of vision as a frame, movements within one second are divided into 24 moments, pre-imagined, and then traced by the user. If the creation of movements fails or movements that greatly disregard the laws of physics are set, the user becomes unable to move for one second. This 24 FPS rule is also forced upon targets touched by the user's palm.

◆ Reverse Cursed Technique
An advanced cursed energy manipulation technique that combines cursed energy, which is negative energy, to produce positive energy. It can be used for healing wounds, and by activating techniques with positive energy, effects opposite to the original can be produced. Very few people can use it, and sorcerers who can heal others are particularly valuable.

◆ Inherited Technique
A special ability possessed from birth. It is activated by channeling cursed energy and exhibits unique abilities specific to each sorcerer. It cannot be activated if cursed energy is depleted.

◆ Binding Vow
A pledge made between oneself and a technique or another party. By imposing risks or restrictions on oneself, the performance of techniques or cursed energy output can be enhanced. If broken, penalties such as losing the benefits gained may occur.

◆ Technique Revelation
A type of binding vow imposed on oneself. By revealing the details of one's technique to the opponent, its effects and cursed energy can be boosted. While there is a risk of exposing one's hand, it is also possible to deliberately spread false information to confuse the opponent. For techniques that are simple and difficult to counter even if the information is known, the disadvantage is small.

◆ Cursed Tools
Weapons imbued with curses. They are graded according to their effects. Some cursed tools are created by sorcerers through prolonged use. The criteria for selecting Special Grade Cursed Tools have not been disclosed.

◆ Jujutsu High School
A four-year educational institution for jujutsu, with only two schools in Japan. The official name is "Tokyo Metropolitan Jujutsu High School," with the Kyoto school as its sister school. The Tokyo school is located in the suburbs of Tokyo and is ostensibly a private religious school, but it is actually a public institution operated with public funds.
It teaches cursed energy manipulation, the rules of the jujutsu world, and general knowledge, producing jujutsu sorcerers and assistant directors. Many sorcerers use it as a base even after graduation, and it also provides mission referrals and support, serving as a hub for the jujutsu world. The school building is protected by Tengen's barrier, and an alarm sounds when unregistered cursed energy is detected. Rewards are paid for defeating Cursed Spirits and curse users on missions.
In addition to the Tokyo and Kyoto schools, there are branch schools based in each prefecture, which are treated as classrooms of the Tokyo and Kyoto schools.

◆ Limitless
The inherited technique of the Gojo family. It materializes "infinity" around the user, preventing all interference and dominating space. It can lower the approach speed of anything the user perceives as dangerous, making it possible to avoid contact with attacks. It can be applied to offense, defense, and movement, but requires precise cursed energy manipulation at the atomic level, making it difficult to handle fully without the Six Eyes.

Technique Lapse: "Blue": The power of "convergence." Creates a虚数 (imaginary number) space with negative cursed energy, generating a powerful attractive force. Can be applied to restraining targets, pulling them in, or accelerating oneself.

Technique Reversal: "Red": The power of "divergence." Generates an impact in the opposite direction of "Blue" with positive energy. Has high output but requires Reverse Cursed Technique.

Hollow Technique: "Purple": The ultimate technique of Limitless, created by colliding "Blue" and "Red" to push out a virtual mass. Possesses extremely high destructive power and requires Reverse Cursed Technique to activate.

◆ Six Eyes
A special ability of the Gojo family that appears extremely rarely, distinct from inherited techniques. It allows the user to perceive cursed energy and techniques as visual information with exquisite detail, and to read the structure and conditions of techniques. Furthermore, it enables precise cursed energy manipulation at the atomic level and the use of cursed energy with almost no loss.

Due to the sheer volume of information, Satoru Gojo restricts visual input with blindfolds or sunglasses. There have never been two Six Eyes users simultaneously; they appear one at a time, extremely rarely.

◆ Blood Manipulation
The inherited technique of the Kamo family. It manipulates the user's own blood and substances it adheres to. It can be applied to offense, defense, restraint, and physical enhancement, and can handle any distance. The sorcerer's blood is toxic to Cursed Spirits.
However, there is a risk of death from blood loss due to blood consumption, and if exposed to water, blood cells are destroyed, making it difficult to manipulate blood outside the body.