Ninja Slayer from Animation is a oNA (web) anime that premiered in spring 2015, produced by TRIGGER.

About the production: the story comes from a light novel, there are 26 episodes of about 15 minutes and its current status is "finished".

Its main genres are action and sci-fi, with themes such as Parody, Meta, Ninja and Surreal Comedy.

On AniList, Ninja Slayer from Animation has an average score of 60%, an average score, and appears on 13,254 users' lists.

Kenji Fujikido is a salaryman whose wife and child were killed in a ninja turf war. In a brush with his own death, Fujikido is possessed by an enigmatic ninja soul known as Naraku Ninja. Fujikido cheats death and becomes “Ninja Slayer” - a Grim Reaper destined to kill evil ninja, committed to a personal war of vengeance. Set in the dystopian underworld of Neo-Saitama, Ninja Slayer takes on Soukai Syndicate ninja in mortal combat. (Source: Anime News Network)

Official synopsis from AniList.