[[quoteright:338:http://static.tvtropes.org/pmwiki/pub/images/a_1462.jpg]]
[[caption-width-right:338:[[FromNobodyToNightmare Ryo Narushima: Before and After]]]]

At the age of sixteen, Ryo Narushima was a straight "A" student. He seemingly had no trouble getting into Tokyo University and joining the elite of society. However, that summer something cracked inside Ryo's head. With a small knife, he brutally murdered both of his parents, leaving only his sister alive and cowering in a corner. After being sent to a reformatory, he learns martial arts from an old convict named [[EvilMentor Kurokawa]] (who tried to assassinate a politician... also with a knife) that helps him overcome his bullying. He continues to study karate while at the same time becoming more and more of a sociopathic monster.

[[BlatantLies Fun for the whole family!]]

The series seems to be a critique of parents pushing their kids too hard in their academics and being too controlling, seeing as it's what makes Ryo violently attack his own. Whenever someone brings it up he seems truly ''pissed'' that he killed them. The manga also has a heavy theme of violence, as it aims to show the thin line between sport and self defense/murder.

The manga was put on hiatus over a legal dispute between the writer and illustrator [[http://www.animenewsnetwork.com/news/2008-06-28/shamo-manga-artist-sues-creator-for-150-million-yen over who should be credited as the creator of the series]]. Thankfully, the dispute was settled and the series concluded in 2015 with its 34th volume.

!!Tropes Within This Manga:
* AbusiveParents: Implied a few times throughout the series.
* ArtEvolution: Not by much, but slowly and surely Akio Tanaka adds more facial details to character's faces as the series progresses.
* AuthorAppeal[=/=]DoingItForTheArt: Like Terrence Malick of the film industry, Akio Tanaka loves to have close up shots of various animals pop up throughout the series. Though much less so in recent chapters.
* BadassLongCoat: Ryo's not a big fan of light clothing.
* BatterUp: How Yamazaki got kicked out of the baseball league.
* BeardOfEvil: Ryo at the very very end of the Black monkey arc.
* BeingTorturedMakesYouEvil: Both lampshaded and played straight. Because Ryo's parents are abusive he murders them. Because he murders them he's sent to the reformatory. Because he murdered his parents the inmates and staff treat him with extreme cruelty. And because of this he comes out much more vicious and depraved than to begin with.
* BetterTheDevilYouKnow: Averted. The old Chinese master chooses the evil Ryo to defeat the only slightly more evil Black Monkey.
* {{Bishounen}}: Toma Takahara. He's a famous ballet dancer.
* BewareTheNiceOnes: Ryo spends the first 16 years of his life being a mild mannered perfect son. After that, not so much.
* BloodBathVillainOrigin
* BloodKnight: Ryo himself.
* BlondGuysAreEvil
* ButNotTooBlack: Fabio Sanshiro the Brazilian Jiu-Jitsu champ, he was introduced as someone who ''should'' have been black going by how others around him found his appearance unique, he was even called ''Macaca'' (misspelling of ''Macaco'') at some point which is an offensive racial slur against blacks in Brazil. It was in the series' new run (Volume 20 and onward) that the art showed his ethnicity.
* ByronicHero: Though capable of redemption (as evidenced by his care-taking of his sister and various small charitable acts shown throughout the manga) ultimately Narushima is depicted as a Byronic hero spiraling into darkness, his chances at reform slowly ebbing away as he gives in to more and more of his depraved and brutal tendencies.
* CastOfSnowFlakes
* CombatPragmatist: Ryo uses actual self defense techniques, like always going for the eyes and groin. He even takes this to some pretty ridiculous extremes digging up dirt on his opponents and blackmailing them to drop out or a contest (so he can get the money of course)
* CharacterFocus: Toma Takahara appears out of nowhere and the story suddenly becomes about him for several volumes.
* {{Deconstruction}}: Arguably, the manga is a deconstruction of the Shonen fighting genre.
* DarkerAndEdgier: Quite possibly than any other fighting manga in existence.
* DeceasedParentsAreTheBest: Well at least Ryo and his sister seemed to think so.
* {{Determinator}} Ryo is almost purely this and hate. No matter how hellish his life is, no matter how many enemies he faces, no matter how large and invincible the people he fights are, no matter how seemingly impossible his goals are, no matter how much pain he is in, he will simply not give up.
* DoomedMoralVictor: Ryo never outright wins even one of his main fights in the entire series. However he some how usualy comes out on top.
* DrivenToSuicide: Ryo's first girlfriend, Megumi.
* DrugsAreBad: Megumi, Ryo's first girlfriend, stabs her friend to death when suffering from withdrawal.
** Ryo takes a special steroid before his match with Sugawara and one of his eyes turn blood red signifying how demonic he has become.
* DisneyVillainDeath: For a series that normally averts such things, it's finally played straight in the case of [[spoiler: Black Monkey.]]
* DyingAlone: [[spoiler: The final fate of Ryo as he dies from his injuries alone in a forest after his fight with the brother duo.]]
* EmotionsVsStoicism: Ryo and Suwagara.
* EvilIsPetty: Suwagara refuses to fight Ryo. Ryo decides that [[spoiler: [[MoralEventHorizon raping his girlfriend]]]] would be the perfect way to get Suwagara to change his mind.
* EvenEvilHasStandards: Invoked - the thugs in the juvenile rehab center that Ryo's being held at are utterly ''disgusted'' at Ryo because he killed his parents, saying that not even they would do such a thing... while being far more despicable than Ryo was. Being a natural weakling doesn't really help Ryo's cause either.
* EvilFeelsGood: Or does it?
* EvilGloating: Ryo does this to Suwagara about [[spoiler:raping his girlfiend]] in their first match.
* EvilLaugh: Ryo does this a few times.
* EvilMakesYouUgly: Just look at the image at the top of the page.
* EvilMentor: Kurokawa, the person who teaches Ryo karate, thus prompting his descent into TheDarkSide is a staunch traditionalist who tried to assassinate the Prime Minister for opening up foreign relations.
* EvilSoundsDeep: Both in the movie and manga, Toma mentions this about Ryo.
* EvilVsEvil: Ryo vs Black Monkey.
* EvilOnlyHasToWinOnce: Lampshaded. Ryo never outright wins any of his main fights. Though he does often come close.
* EvilVirtues. Ryo may be a cheating, murderous rapist but he is also [[AmbitionisEvil ambitious]], hardworking, resorceful and determined.
* EyeScream: Quite a few times.
* FailureIsTheOnlyOption: For as BadAss and invincible Ryo is often presented he never actually outright wins any of his main fights in the manga. He does however win against a few no names (sometimes) and its strongly implied that he has won many fights in the street outside of the ring. This in turn makes him out as a sort of DoomedMoralVictor.
* FromBadToWorse: Despite becoming a BadAss after getting out of the reformatory Ryo never finds any long lasting success in his [[CheatersNeverProsper martial arts career]] and only causes more trouble for himself and [[DoomMagnet the people around him.]]
* [[{{Filler}} Filler Arc]]: A lot consider the Black Monkey Arc to be so. Others say it was character development.
* FromNobodyToNightmare: Take a wild guess.
* GoodGirlsAvoidAbortion: [[SubvertedTrope Subverted]] with Moemi who aborts [[VillainProtagonist Ryo's]] [[ChildbyRape potential son]].
* GroinAttack: Ryo does this in the reformatory to his rapist, Masa, with his [[ManBitesMan teeth]].
* HeelFaceTurn: In a bizarre example Ryo's teacher the man responsible for Ryo learning to become a ruthless martial artist sees the error of his ways and turns good durring the final days of his life. He even apologizes to Ryo and tries to get him to stop being as evil.
* HairTriggerTemper: Ryo is very quick to anger.
* HumanShield: Ryo uses Blue Monkey as this against Black Monkey, though oddly, no bullets were involved.
* HumiliationConga: Ryo may come off as a BadAss but he goes through this quite often. He gets raped in jail, urinated on by a she male, beaten horribly every day by his one eyed trainer, and possibly by his parrents which drove him to murder in the first place.
* InNameOnly: Now a Chinese indie film! With no gore and Chinese wuxia style!
* InvincibleHero: Averted; Ryo loses/is disqualified from a fair number of fights even when he's cheating his ass off. He also goes months without training and becomes a wimp.
** Also, Ryo is by NO MEANS the strongest in the series. Literally every main fight he has, he is outmatched (sometimes severely outmatched heck he even at one point gets beat up by a transvestite prostitute). And besides some filler fights, he never outright wins any fight. However, this is where his VillainousValor comes into play.
* IWillFindYou: Ryo searching for his sister.
* LampshadeHanging: The "special sports program" that allows a karate master to teach children in a ''prison'' is lampshaded with one sentence. It refers to the martial arts program as "famous" implying it's very controversial and debated in the media. [[BigLippedAlligatorMoment It's never mentioned again.]]
* LightIsNotGood: It is VERY subtle in the series, but it's there, and arguably a main point of the series. One example is Mochizuki, who depending on your point of view, is actually the villain. Another is Ryo's family (particularly mom and dad), who on the surface seemed like good people. However, LightIsGood is played straight with Toma.
** [[spoiler: Though ultimately LightIsGood is also averted with Toma. For all his good intentions, the only reason why Toma means to be kind to Ryo is because he has never gone through any lasting loss and harm, being the InnocentProdigy that he is. Ryo even mentions this, that he is like a child and has no blood thirst, and the entirety of the Black VS White chapters of their fight is translated simultaneously as a kind of mental battle while Toma is trying to save Ryo while fighting off his corruption. [[GoneHorriblyWrong It didn't work.]] Since Toma's goodness is not so much about his being GOOD as it is about his never being exposed to evil in his life, it is a fragile thing -- he ultimately cracks and gives up on trying to save Ryo and ends up trying to kill him with the best of them.]] Of course, that might just go to show how much Ryo is fucking EVIL inside.
* LockedIntoStrangeness: Natsumi, after years of substance abuse.
* ManBitesMan: Ryo bites off a part Isao Kanayama's (Me-Kum Kim's) nose during their brawl in the burning shack
* MarkOfTheBeast: In one scene early in the manga, Ryo marks up his body with paint in order to give himself a more "evil look" to which his girlfriend at the time replies, "You look like a devil."
* MurderIsTheBestSolution: Ryo's sister says early on that she understands why he had to kill their parents.
* MusclesAreMeaningless: Ryo is a natural weakling and very rarely has any real mass to him throught the series. This is especialy noticable in the Toma arc. The only exception being when he had to put on bulk to fight against Suwagara
** In addition to this most people who fight against Ryo tend to be physicaly bigger (not that it usually helps)
* NearVillainVictory: Happens to Ryo a lot. The most notable being the first fight between Ryo and Sugarawa.
* NoodleIncident: The narration is never crystal clear about how much and to what extent Ryo's parents were hard or/and abusive with him, Ryo takes it as if they violated his very soul, but the narration makes it very fragmented and disconnected, after progression Ryo still resides in UnreliableNarrator territory when coming to his "abusive" parents. His sister does reinforce that they would have (possibly literally) wound up killing him if he didn't murder them first, but we're still never ''shown anything''.
* ThePsychoRangers: The [[ArrogantKungFuGuy Black Dogi]] are this in comparison to [[AllLovingHero Toma's]] team.
* PrisonRape: Technically "reformatory rape", but the same principle applies.
* RageAgainstTheHeavens: Despite all of the horrific crimes that Ryo commits. The true villain of the manga is society at large. Society is what turned Ryo into the monster that he is (as well as many other characters for that matter) And towards the latest chapters, it is very apparent that this is what Ryo is truly fighting against. The hypocrisy of society in everyday life and those who pretend to be good, but are really in some ways, even worse than he is. In this way, Ryo is actually more of a Byronic Hero than a true villain. Sometimes.
* RapeAndRevenge: Ryo to Masa twice, first when [[ManBitesMan Ryo bites off Masa's penis]] and later, after learning karate, Ryo beats him to near death in a sparring match.
** Ryo, in one of his few heroic moments, takes down a horde of yakuza who kidnap, rape and torture [[HookerWithAHeartofGold Megumi]] to get to him.
** Later attempted by Moemi when she [[BestServedCold stabs Ryo before his match with Toma so that he will bleed out during the fight.]]
* RealityEnsues: Does it ever.
* PostRapeTaunt: Sugawara hallucinates Ryo mocking him with this.
* SexIsEvil: Always with Ryo. If he doesn't rape you he's working as a gigolo. And let's not forget the male/male rape scenes...or better yet, let's [[{{Squick}} leave it unmentioned]].
* ShrinkingViolet: Ryo is this, prior to learning karate.
* ShoutOut: The female judoka that went against Toma is nicknamed "Yawara" referencing a famous real-life Japanese judoka, which in turn nicknamed Yawara after the [[Manga/YawaraAFashionableJudoGirl Naoki Urasawa manga]]. So it's a two-layered reference!
* SlidingScaleOfIdealismVersusCynicism: Just about every character has a serious character flaw and almost all of the traditionally "good" characters wind up horribly injured. Recent arcs are starting to slide the other way, though.
* StartOfDarkness: Seeing as what kicks off the story is the main character murdering his parents, this was a given.
* StupidSexyFlanders: Toma invokes this more than once, but Sanshiro, the Brazilian Jiu-Jitsu champ, is striken by it right on.
-->'''Sanshiro:''' Shit! I ain't a fag! But I... I think he's beautiful!
* StrikeMeDownWithAllOfYourHatred: To Toma, in the end of volume 28.
* SuicideMission: Ryo vs Toma. Ryo gets injured before hand and knows the fight will aggravate his wounds to the point of killing him, but still chooses to fight anyways.
* TakeOurWordForIt: The picture Ryo draws as a child is apparently so disturbing that it made his teacher at the time retire. It is never shown in the series.
** And considering all of the other horrific things that they show over the course of the series, i.e. rape, murder, prostitution, maiming the fact that THIS was the one thing that they refused to show really makes you wonder just how disturbing it really was...
* TakingYouWithMe: Ryo vows to do this to Toma in their fight.
* TakeThat: Shamo really, ''really'' likes taking the piss out of MMA competitions.
* TournamentArc: 2 separate ones.
* TragicHero: The main character is an extremely dark example of this with more emphasis on the tragic than the hero part. Also Suwagara.
* TheUnfettered
* UsedToBeASweetKid:
* VillainsNeverLie: Strangely, lying is one of the few offenses that Ryo doesn't commit. Go figure.
* {{Villain Protagonist}}: Ryo is a murdering, cheating, rapist who only fights for the rush and money it brings. He's the main character.
* VillainousWidowsPeak: Ryo, at times.
* ViolenceIsTheOnlyOption: And even when it isn't the only option, ''nobody'' hesitates to choose it as one.
* WillNotBeAVictim: Both Ryo and his sister - everything they do from murder to robbery to rape can be argued as them just wanting to survive. This concept is the primary motivation for all of Ryo's development. Whenever anybody does anything towards him, he almost always comes up with ''something'' to strike back, no matter how awful the means.
* YourApprovalFillsMeWithShame: Ryo and Sugarawa in their second fight.
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