Ninja Slayer

Ninja Slayer (Japanese: ニンジャスレイヤー, Hepburn: Ninja Sureiyā) is a novel series created by American authors Bradley Bond and Philip "Ninj@" Morzez. After they gave permission for Japanese translations to be published via Twitter, Enterbrain published the first translated novel in September 2012, with illustrations by Warainaku. Sixteen novels have been released as of June 2016. It has received three manga adaptations. An ONA adaptation produced by Trigger and directed by Akira Amemiya which aired from April to October 2015.