Demon Lord 2099 (Japanese: 魔王2099, Hepburn: Maō 2099) is a Japanese light novel series written by Daigo Murasaki and illustrated by Kureta. The series began publication by Fujimi Shobo under their Fujimi Fantasia Bunko imprint in January 2021. The light novel series has been licensed in English by Yen Press.^[2] A manga adaptation by Kiiro Akashiro was serialized online on Kadokawa Shoten's Shōnen Ace Plus from November 2021 to June 2022. A second manga adaptation by Yutaka Sakurai began serialization on the same website in March 2023. An anime television series adaptation produced by J.C.Staff is set to premiere in Q4 2024.

In the magical fantasy world of Alneath, the villainous Demon Lord Veltol Velvet Velsvalt was slain in battle by the hero Gram. 500 years later, his subordinate Machina Soleige uses magic to revive Veltol. During his time away however, Alneath underwent a catastrophe known as the "Fantasion" when it merged with the industrial world of Earth in the year 2023. This resulted in prejudice between various races, the collapse of national boundaries, and wars between newly established city states. After the wars, relative peace broke out, and Alneath's magic was combined with Earth's industry to create magical engineering known as "magineering". Veltol is revived in the year 2099 in the city state of Shinjuku (formerly Tokyo), and together with Machina and her hacker friend Takahashi, he attempts to regain his power and once again attempt world domination.^[1]

Veltol Velvet Velsvalt (ベルトール＝ベルベット・ベールシュバルト, Berutōru Berubetto Bērushubaruto)

Voiced by: Satoshi Hino^[3]

Veltol is a villainous immortal lord originally from the fantasy world of Alneath whose ambition is to rule the world. Slain in battle by the hero Gram, he does not completely die and is reincarnated by his subordinate Machina 500 years later in 2099, by which time Alneath has merged with Earth. Veltol decides to conquer these merged worlds, but is now powerless due to his magic abilities coming from belief from his followers. He thus works with Machina and her friend Takahashi to rebuild his following.

Machina Soleige (マキナ＝ソレージュ, Makina Sorēju)

Voiced by: Miku Itō^[3]

Machina was one of Veltol's "Six Dark Peers", his most trusted followers, who has the ability to use fire magic. She also used magic to revive Veltol to life and is his most loyal follower. With Veltol having lost his magic powers, he moves in with Machina after he is revival.

Takahashi (高橋)

Voiced by: Hana Hishikawa^[4]

Takahashi is a hacker born into the world after the Fantasion, and a friend of Machina. She works with Machina to help Veltol regain his power.

Demon Lord 2099 won the 33rd Fantasia Grand Prize.^[17][18]

• Ishura, another light novel series illustrated by the same artist