During last month Anime Expo 2014 held in Los Angeles, California from July 3-6 it was revealed that Studio Trigger will adapt the Ninja Slayer novel series to anime. Director Akira Amemiya (Inferno Cop) will direct the studio's upcoming animation. Amemiya also served as an episode director for Panty & Stocking with Garterbelt, Kill la Kill, and Black Rock Shooter. He also directed the Gurren Lagann Parallel Works video anime.
The "cyberpunk ninja action drama" is set in the near-future city of Neo Saitama, where ninja souls have been unleashed. The story follows Fujikido Kenji, a salaryman whose wife and children were killed in a ninja battle. He is then possessed by a ninja soul and becomes a ninja slayer, devoted to killing all ninja to avenge his family.
The story was originally posted piecemeal on Twitter by Japanese "translators" Honda Yu and Sugi Leika, allegedly translating the work of American authors "Bradley Bond and Philip Ninj@ Morzez." After the story grew in popularity, Enterbrain published the first Japanese-translated volume in print, Ninja Slayer: Neo Saitama in Flames, in September 2012. The story then inspired three comic adaptations from Enterbrain and Kodansha, as well as an audio drama with Toshiyuki Morikawa as the title character.