Black Demon Series

The Black Demon Series (黒鬼シリーズ) are the strongest Cursed Gear because they contain the highest ranking demons.

Many of the demons are aggressive, specializing in power amplification and weapon enchantment.

The death rate of those who challenge Black Demons is exceedingly high compared to other Demon Weapons. Not many people are capable of wielding a Black Demon weapon. Anyone who is a candidate for the Black Demon Series has been experimented on, but these candidates are exceedingly difficult to create. Successful candidates are even more rare. Anyone bearing this rank of weapon can easily kill multiple vampires armed with second-class weapons.

Demons
There are eight that have been named so far.

Byakkomaru
A sword-gun type of Cursed Gear contracted to Major General Shinya Hīragi. Its bullets appear as white tigers, and it may fire one shot that appears behind its target.

Gekkouin
A bow-and-arrow type of Cursed Gear contracted to Special Private Yoichi Saotome. It provides its bearer with the ability to see great distances, and it can fire bird-like arrows at multiple targets simultaneously.

Asuramaru
A sword type of Cursed Gear contracted to Special Private Yūichirō Hyakuya. It has a special ability called Asura-Kannon that materializes an array of swords behind its bearer.

Kiseki-o
A twin sword type of Cursed Gear contracted to Special Private Shihō Kimizuki. It has a special ability that materializes and opens the devil's coffin on the count of nine.

Mahiru-no-Yo
A sword type of Cursed Gear contracted to Lieutenant Colonel Guren Ichinose. The demon was his lover when she was a human. It is the result of Mahiru being absorbed by the Noya curse. Mahiru-no-Yo powers depends on the demons power. If Mahiru and Noya separated it can turn the host into a Namanari. However the sword still remains, it grants the host tremendous power and speed. Mahiru-no-Yo can return to Guren hands if the sword is away, as well as command it.

Noya Hienma
A sword type of Cursed Gear contracted to Lieutenant Colonel Guren Ichinose. It has a special ability to grant the host immense strength and power as well as enhanced healing and senses while filling them with desires. The more desire his host has, the greater his power becomes. The demon's transformed into Mahiru-no-Yo.

Mahiru Hīragi
Manifested physically, after the separation of Noya and a Cursed Gear at the same time contracted to Lieutenant Colonel Guren Ichinose. Similar to Mahiru-no-Yo, it grants the host tremendous power and speed when invoked. Her special ability is ''Mahiru! Moon Demon Stance'' as shadows appear from the weapon, cloaking it's wielder in a fiery energy, effectively withstand other invocations. It's second ability is ''Mahiru. Moonlight Stance'' with the sword pointed downwards very large ovals appear, expanding outwards at various lengths. The sword itself has various effects such as poisoning other Cursed Gear wielders upon making contact.

Raimeiki
A sword type of Cursed Gear contracted to Lieutenant General Kureto Hīragi. It covers its bearer with electricity. The more desire the host grants the more extensive, speed the host gains and more powerful the electricity it produces.