Ability

Ability (異能力,) is a special force possessed by many individuals throughout the world. A person who possesses an ability is called an ability user (能力者,).

The Great War
Before the Great War, samurai were once unable to adapt to the rise in guns and rifles, which led them to perish. Following such defeat, a Great War emerged, during which tanks and gun turrets were proven ineffective. Instead, entire forces of countries stampeding through enemy countries ultimately crushed opponents. Moreover, naval battles were lost against advanced aircraft weapons that ultimately destroyed nautical forces. After this war, the Great War surfaced, which acknowledged ability users as the main forces of destruction and weapons in battles.

European powers recognized the efficiency of ability users in the fight and deployed them to the main battlefield. A group of highly skilled ability users known as the Transcendents were dispatched, but they soon clashed and produced even more casualties and war damages. Furthermore, sometime during the end of the war, an extinction weapon known as the Shell was developed by English engineers including H. G. Wells by intentionally creating a singularity and weaponize it.

Concomitantly, the Japanese military likewise saw ability users' importance and power during the war. As a result, military physician Ōgai Mori submitted the "Immortal Regiment" (不死聯隊,) plan to the Emperor, which focused on creating an infantry that could survive countless injuries throughout the war. This scheme primarily used the healing ability of Akiko Yosano, who was enlisted by Mori. It came to fruition in Tokoyami Island located in the Pacific Ocean, where close and physical combats were mainly fought due to electromagnetic interference of northern lights that rendered electronic devices useless. Initially successful, Yosano later stopped using her ability after becoming distraught with the inhumane events unfolding during the war, more so because the troops blamed her for dragging the war and prolonging their agony in fighting only to be constantly attacked and injured by enemy forces. Sometime during the war, upon the Japanese government's orders, Ōchi Fukuchi entered the battlefield, who was known for his outstanding power due to his ability. As such, he engaged in brutal battles and tortured soldiers and civilians alike, among others.

Post-War
The Great War later ended partly due to the efforts of ability users. However, as a result, a great number of ability users who were engaged in legal professions had decreased. Majority of them either secluded themselves from society or affiliated themselves with underworld organizations. During such period, the Japanese government refused to admit the existence of ability users to the public, regarded by society as mere rumors or lores. Though it was not forbidden at the time to expose the reality of such entities, there was a dark shadow cast over their existence.

Nonetheless, upon being discovered that a proportion of ability users possessed highly lethal powers, the government created the Special Division for Unusual Powers, a department comprising of ability users responsible for secretly monitoring dangerous ability users throughout the country. Moreover, there was a certain group of special ability users regarded as the most important individuals in Yokohama who received the government's secret protection referred to as the Witness Protection Program. Such figures were believed to have possessed certain secrets that had to do with the foundation of the country. As such, they were targeted by countless enemies, including foreign military parties, local criminal organizations, and the like.

Among the aforementioned organization is Sōseki Natsume, who devised the Tripartite Framework. In this framework that aimed to preserve the balance of peace and order in Yokohama, the Special Division and the military police would oversee and handle ability-related affairs during the daytime, the Port Mafia at night, and the Armed Detective Agency in the twilight. When this plan was finally realized, Natsume retired shortly after.

In the present era, ability users are not unknown in the society, though not entirely recognized mostly due to the intervention of the Special Division and other government departments. Moreover, albeit majority of ability-related cases are monitored to be criminal in nature, there are also organizations allowed by the government in utilizing abilities legally, such as the Yokohama-based Armed Detective Agency comprised of gifted detectives who take on dangerous cases that are too much for the military and the police to handle.

Information
It is said that a person can have no more than one ability. An ability user may be conscious of and can control their ability, though in some cases, an ability may be uncontrollable and activated automatically. Moreover, a person may be an ability user since birth or could manifest such power in later life. In some cases, it is said that abilities are considered as a curse rather than a blessing to their users.

An ability is also powered by their user's soul and will as their energy source. Therefore, when an ability user dies, their ability is eviscerated. The only exception to this are singularities which are capable of outlasting their user(s) infinitely as massive energy.

Singularity
Singularity (特異点,) occurs when two abilities cancel each other out and create something different from either skill. As studied by the Special Division, the singularity phenomenon develops into an unpredictable direction due to a resultant loss of control over abilities. In most cases, one of the abilities is expected to win over the other. It is also possible albeit rarely where neither party wins, or, as researched by England, where two abilities cause a reciprocal reaction and generate a greater effect in scope compared to when activated individually.

Professor N further explained that singularities are the only form of an ability that is capable of existing infinitely and outlasting their users as mass energy. Though singularities typically occur when two or more compatible abilities clash, there is in fact another way for it to occur. The second way is for certain ability users to use their ability on themselves and multiply that use repeatedly until a singularity occurs. However, the risk to this is the user being devoured by their own ability due to the massive amount of energy this singularity produces.

During the War, Germany managed to weaponize singularities and shared this research with their allies France and Japan who used the research to create man-made sentient singularities that produced Paul Verlaine and Chūya Nakahara.

Non-abilities
These are special powers possessed by individuals but are not considered abilities.