Ninja Slayer

The Neo Saitama of the future is a sprawling urban landscape constantly flooded by neon light. And in its shadows lurks a vast criminal world filled with all sorts of shady characters. Among them are the deadliest force known to humanity... ninjas! These merciless warriors lord over the cityscape with their overwhelming karate, influencing the private and public sectors equally. But their time is about to come to an end. A force known as Ninja Slayer is determined to rid this world of Ninjas, and he’s willing to go through heaven or hell to do so.

(Source: Kodansha USA)

Ninja...
Ninja were...
merciless demi-gods, ruling Japan with their karate in the age of ninja tranquility.
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 these ninja was long forgotten.
Now, in the future where the universalization of cynbernetic 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.
(Source: Tokyo Otaku Mode)

Ninja...
Ninja were...
merciless demi-gods, ruling Japan with their karate in the age of ninja tranquility.
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 these ninja was long forgotten.
Now, in the future where the universalization of cynbernetic 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.
(Source: Tokyo Otaku Mode)

Manga adaptation of the second part of the Ninja Slayer franchise.

Following Laomoto Khan's defeat at the hands of Fujikido and Naraku Ninja, the Soukai Syndicate is no more. However, its downfall allowed the Zaibatsu Shadow Guild to enforce their rule over the Kyoto Republic - believing that ninja are superior to humans and live to rule them, they usher in a new era of terror. With newfound resolve to continue his quest of vengenace, Ninja Slayer embarks on yet another journey to exterminate all ninja.