Yami (闇, Darkness) is a worldwide organization of martial artists who use their skills to gain power and the main antagonists of the second half of the series.
It should be noted that because Yami's operations are mostly in Japan and its members are mostly Japanese, the organization mostly goes by the name "Yami". However, Christopher Eclair has called it by the name "L'Obscurité", which means "The Darkness" in French, and then stating that the organization's name was "'Yami' in this country", referring to Japan and indicating that the organization may be known by other names synonymous with "darkness" depending on the country of operations.
Yami was created after WWII to keep the old arts alive because many martial artists died during the war. It is divided into three divisions: the 'Hand-to-Hand Combat Division, Weapons Division and Ballistics Division. The former two divisions normally work separately and are led by two completely different units but recently have joined forces to complete their goal of starting the "Eternal Setting Sun" and claiming the title of "Strongest in History" while the latter consists of underlings of the former.
The leaders of the Hand-to-Hand Combat Division are One Shadow Nine Fists and the leaders of the Weapons Division are the Hachiō Executioner Blade. Both teams are considered to the strongest in their divisions, and overall equal in terms of manpower and skills. The Ballistics Division lacks a similar leadership group and is led by the above groups.
Yami is nearly the polar opposite of Ryōzanpaku it has enough funds to become a nation of its own while Ryōzanpaku was on the verge of bankruptcy, but at the same time, its members lack the emotional bonds with one another that is so often present amongst the members of Ryōzanpaku. Yami has 2000 tons of gold as military funds at their disposal.
Its members seem to anticipate an event known as the Eternal Setting Sun, which seemingly intends to create a Third World War so that their skills will not "rot away in these times of peace". Yami's power has now become so strong that the One Shadow, Nine Fists is able to arrange meetings with major political figures in Japan under the sanction of the Japanese government itself.