The main antagonist in the central arc of Violence Jack, Slum King is a sadistic warlord who rules over the majority of the devastated Kanto region.

He given a heavy set of Samurai armor and an iron mask to prevent any overgrowth of muscle tissue and is locked away in a shed by his family out of fear.

A young boy who survived the hell quake and became the leader to a group of children who live on the outskirts of Slum Town.

Once a fifth grade student with a good heart and innocent spirit, Ryu's world changed forever after the Great Kanto Hell Quake.

The series takes place in the ruins of the Kantō region, after a massive earthquake (which in the OVAs was triggered by a Comet strike) dubbed 'The Great Kanto Hellquake'.

However, Jack's unpredictable nature means that bystanders get injured or even killed on occasion as a consequence of his vicious fighting style.

In this continuity, Jack is an alternate form of Amon, while Akira is now living as an amnesiac warlord known as the Skull King, with the iconic Devilman demon Jinmen as his chief subordinate.

With the help of his child form, his true form as Amon, a young boy named Ushio, and the reborn Sirene (who merges with the heroic Sara, essentially becoming a Devilman), Jack leads the assault on the Skull King's fortress, succeeding in restoring Akira's memories and igniting a rivalry between the duo.

Violence Jack 20XX is a condensed remake of the original series, with select events rearranged and recontextualized into a continuous narrative.

Five years later, the serialization continued this time in the magazine Weekly Manga Goraku, published by Nihon Bungeisha, and ran from August 5, 1983, to March 23, 1990.

[4][13][14] This serialization was irregularly published, stopping on August 19, 2005, and restarting on November 2, 2007, to end on April 11, 2008, in number 17 of Weekly Comic Bunch.

In this time of weakness, a ruthless man known as the Slum King took control of the Kantō Plain by brute force and rules it with an iron fist.

However, in the middle of a trek across the land with his great forces at his side, he encounters a mighty beast-like man wearing a battered green jacket and a yellow ascot who slaughters his men and then targets the Slum King himself.

The Slum King survives the wave and returns to his immense fortress where he tells his men that no one can dare oppose him and be permitted to live.

The second OVA, called Violence Jack: Evil Town (バイオレンスジャック　地獄街, Baiorensu Jakku: Jigokugai),[27] was released on December 21, 1988.

Section B, which consists of criminals and lunatics, is controlled by the huge gang leader Mad Saurus and his second in command, Blue, the drag.

Section A is attempting to dig their way back to the surface when they uncover Violence Jack, who has apparently been sealed in a rock wall since the earthquake.

At the meeting, the Section C leader Aila Mu offers to hire Jack as their guardian and tells him a disturbing story: After the earthquake occurred, the men of both A and B ran wild, capturing and raping the women until they learned that there was enough food for long-term survival.

Jack arrives in time to rescue Section C and defeats the raiders, killing Blue and severely wounding Mad Saurus.

In order to combine their power, Mad Saurus consumes her corpse, transforming into a devilish red creature to battle Jack a second time.

The battle between Mad Saurus and Jack gives Section C enough time to make their way to the surface, which is now an open, grassy plain with several ruined buildings scattered around instead of a city.

Aila Mu laments that her skills as a model are useless in the ruined world, but the rest of Section C assures her that she is a capable and beloved leader.

The last OVA, Violence Jack: Hell's Wind (バイオレンスジャック　ヘルスウインド編, Baiorensu Jakku: Herusu Uindo Hen), was released on November 9, 1990.

Jack departs, strangely heartened by speaking with the orphaned boy, who vowed to become stronger than anyone to protect the people around him.

[29][30][31] As fans wanted to see it uncut, Right Stuf arranged with Manga Entertainment the release of an unedited version in November 1996.

The OVAs were released in their uncut version by Manga Entertainment in France in 1999 and by Fox Pathé Europa in 2003, and in Italy by Shin Vision also in 2003.

[46][47] In July 1995, another novel titled Violence Jack: Golden City (バイオレンスジャック　黄金都市編, baiorensu jakku ōgon toshi hen), written by Tatsuhiko Dan with illustration by Go Nagai, was released by Kodansha.

It depicted its post-apocalyptic setting as a desert wasteland with biker gangs, anarchic violence, ruined buildings, innocent civilians, tribal chiefs, and small abandoned villages.

It's a great Japanese comic.”[52] Kentaro Miura, creator of the manga and anime series Berserk (1989 debut), cited Violence Jack as an influence.

Geist (1986)[55] and the Atlus post-apocalyptic video game series Digital Devil Story: Megami Tensei II (1990 debut).