Ninja Slayer is a cyberpunk action anime series that follows the story of Kenji Fujikido, a salaryman who becomes possessed by a ninja spirit seeking revenge against other ninjas. Set in the dystopian city of Neo Saitama, the series explores themes of vengeance and transformation through high-octane battles and a stylized approach. Known for its unique animation style and intense fight scenes, Ninja Slayer offers a distinct take on the ninja genre.