On the surface, Shiroishi is just a simple-minded guy who works at a metal shop and enjoys stopping by the red light district. At night Shiroishi becomes Ichi the Killer. When pushed to the brink emotionally, Ichi becomes a sadistic monster capable of ripping men to shreds. At first Ichi only kills when his guardian, Jijii, pushes him to. After awhile, fueled by an insatiable violent perversion, Ichi begins to grow in ways Jijii hadn't dared to hope.

Ichi is a cowardly man-until he's pushed into a mental breakdown and becomes a ruthless killer. When he gets mixed up with the sadomasochistic yakuza boss Kakihara, it triggers an orgy of blood and unmatched depravity.
 (Source: Seven Seas)

A masochistic mobster meets his match in the dark streets of Tokyo. His nemesis, Ichi, is a psychopathic killer with an unrelenting thirst for bloodshed. A horrifying secret burns in his mind, and his hands deal death without mercy. At last, the shrouds of mystery are parted to reveal the origin of the monster. The city will know its greatest fear at the unveiling of Ichi the Killer.
 
(Source: Anime News Network)

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Growing up a target of bullying, a senior high student, Shiroishi Hajime, is a skilled karateka, but goes completely weak at the knees with fear when it comes to fighting. Among all this, a power junkie and classmate of Ichi who does nothing but fighting, Akakuma Dai, sets his eyes on Ichi. When Ichi starts to shed tears, all of a sudden a violent impulse that resided inside him is unleashed. 
Note: Chapter count includes 2 extra chapters.