A woman died a suspicious death in the forest. Beside her, the sword-smith Amon finds a new-born boy with a tragic fate and takes him in. About 10 years later, this boy who is named Gai and who has become Amon's apprentice, loses his right arm in an accident while making a sword. Amon decides to take a sword called "Shiryuu," which is a sword with demonic powers that has been passed down for generations, and fashion it into an artificial arm for Gai. That was the beginning of it all...

The story of this boy, who has become one with a demonic weapon and is drawn into a cruel fate in which he must face countless battles, can be seen as either the story of "a beautiful weapon and an ugly person" or of "the cruelty of weapons and the beauty of humans." This is a completely new world of comic noir.

Type: ONA
Episodes: Unknown
Status: Finished Airing
Aired: Mar 23, 2018
Producers: LandQ studios
Licensors: None found, add some
Studios: Production I.G, DLE
Source: Manga
Genres: Action, Seinen, Supernatural
Duration: Unknown
Rating: None

Chief Director: Takahiro Ikezoe (the Show By Rock!! series director)
Director: Tomohito Naka (the new Initial D movies)
Series Composition: Toshiki Inoue (Sword Gai mangaka)
Character Design: Atsuko Nakajima (Hakuouki)
Art Director: Seiko Akashi (Dorami & Doraemons: Robot School's Seven Mysteries)
Color Setting: Masato Sasaki (Lemon Angel Project)
3DCG Director: Akihiko Kimura (Kuroko no Basket: Last Game), Kenji Isobe (Kuroko no Basket: 3rd Season)
Sound Director: Toshiki Kameyama (Sakurada Reset)
Music: Kotaro Nakagawa (the Active Raid: Kidou Kyoushuushitsu Dai Hachi Gakari series)
Studio: LandQ studios
Production: DLE, Production I.G

Gai Ogata: Yuuto Uemura (the Bungou Stray Dogs series)
Seiya Ichijou: Yuuichirou Umehara (Tsukipro The Animation)
Sayaka Ogata: Yuuka Aisaka (Net-juu no Susume)
Amon Ogata: Jouji Nakata (Fate/Zero)
Kyouka Kagami: Rina Satou (Choujigen Game Neptune The Animation)
Marcus Lithos: Hiro Shimono (Shingeki no Kyojin)
Naoki Miki: Tomokazu Sugita (Aho Girl)
Takuma Miura: Toshihiko Seki (Kill la Kill)
Grimms: Takaya Kuroda (Durarara!!)
Tatsumi: Kenji Hamada (Hakata Tonkotsu Ramens)
Mina Hiratani: Yuu Shimamura (the Bungou Stray Dogs series)
Kigetsu: Masaharu Satou (Dragon Ball Super)
Kazuma Matoba: Takaya Hashi (Naruto Shippuden)
Kei: Sumi Shimamoto (Gintama)
Hakimu: Kousuke Toriumi (Dies Irae)
Midoriko: Ayane Sakura (the Boku no Hero Academia series)
Yasuko Tanaka: Urara Takano (Hunter x Hunter)
Issei Ariga: Kouhei Murakami (Paboo & Mojies)
Aronis: Michiko Neya (Eureka Seven)