Ninja Slayer

is a Japanese novel series written by "Bradley Bond and Philip Ninj@ Morzez" (fake american duo) and being "translated" to japanese by Honda Yu and Sugi Leika. The novels were adapted into 3 manga series with sub-titles: "Machine of Vengeance" shonen illustrated by YUGO Yuuki; "Glamorous Killers" shojo illustrated by SAOTOME Ageha and "Kills" by SEKINE Koutarou. A short-form (12 min episodes), 26 episode original net anime adaptation by Studio Trigger ran from Apr 16, 2015 to Oct 8, 2015.

Plot
Ninja... Ninja were... merciless demi-gods, ruling Japan with their karate in the age of ninja tranquillity. But, “some” committed a forbidden form of hara-kiri storing their souls at Kinkaku Temple for future resurrection. Their lost history was falsified and concealed and the truth about ninja was long forgotten.

Now, in the future where the universalization of cybernetic technology and electronic networks are God, suddenly, sinister ninja souls, resurrected from thousands of years past are unleashed on the dark shadows of Neo-Saitama. Fujikido Kenji, 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. 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 ninjas in mortal combat.