Kōkō Tekken-den Tough (高校鉄拳伝タフ, Kōkō Tekkenden Tafu; literally: "High School Iron Fist Legend Tough"), is a martial arts manga series written and illustrated by Tetsuya Saruwatari. A sequel series, titled simply as Tough (TOUGH—タフ—, Tafu) was introduced in 2004 which continues the story further after the first series ended its run. The third series, Tough: Ryu o Tsugu Otoko (TOUGH 龍を継ぐ男, TOUGH Ryū o Tsugu Otoko; literally: "Tough: The Man Who Inherits The Dragon"), starring one of illegitimate children of Kiryu Miyazawa, has been serialized in Shueisha's Weekly Playboy since December 21, 2015. A spin-off series, Tough Gaiden: Oton (タフ外伝 OTON, Tafu Gaiden OTON), has been serialized in Business Jump since 2004.
The story revolves around Kiichi Miyazawa, a 17-year-old teenage high school student and his father, Seiko Miyazawa, who is training him in the family's secret martial art, Nadashinkage-ryu, a fighting style that was created around the end of the Meiji Era Japan. The style itself uses punches, kicks, throws, grappling, as well as knowledge of striking pressure points and vital points on the human body. With a passion for martial arts, Kiibo is striving to become strong by testing his skills against various fighters from different areas of Japan, as well as the world, via street fights and tournaments.
In the second part of the story, The story starts two years later after the end of high school iron fist legend, the main protagonist Kiichi Miyazawa “Kiibo”, became the heir of his family’s martial art Nadashinkage-ryu after the previous one his father Seiko Miyazawa suffered a crushing defeat at the hands of his evil twin brother and Kiichi’s uncle Kiryu. In order to pay for hospital bills Kiichi has turned to fighting in illegal underground matches called dark fights in which almost anything is allowed. Kiichi has become a mainstay in these fights, not only because of his outstanding victories but that he refuses to seriously injure any of his opponents, upholding his father’s teachings of never killing anyone.
During one particular match in which Kiichi was on the verge of losing, his uncle appeared only to see the progress of his nephew’s training and to tempt him into using a killing technique on his adversary. Refusing to give into such treachery Kiichi manages to score a win, it was during this fight that we are revealed that Kiichi mistakenly killed an opponent during an MMA (Mixed Martial Art) tournament using a technique that Kiryu taught him. That and the fact that he crippled his father are the main reasons that Kiichi must defeat his uncle.
At the end of Kiichi’s last match a secret sect of monks called the Hagyu have sent one of their own students to end the Nadashinkage style and its current practitioners, Suzuki “The Wind” Minoru is the one chosen to defeat Kiichi. Elsewhere several benefactors have formed into starting another MMA tournament called the Hyper Battle, which is held once a year in order to find the world’s strongest fighter, a title which is held by one called the Battle King. Kiichi at first seems uninterested but later relents and starts training in order to participate, after challenging students at a karate dojo he comes face to face with the one sent to eliminate him “The Wind” Minoru. After testing their abilities Minoru starts to respect him and asks Kiichi to take him to meet his father. It is here that we are shown the consequences of losing to Kiryu. Seiko Miyazawa “The Quiet Tiger” is shown in a childlike state, barely able to feed himself and at times necessitating the use of a wheelchair, he is suffering from a condition called Apraxia.
Wanting to help the man who once defeated the Hagyu, the wind starts treating him himself with knowledge of acupuncture and pressure point massage, in the past Seiko was challenged by the Hagyu school but made the fight look like it ended in a draw in order to make the school not look bad, Minoru was one of the few to take notice. After much treatment at Minoru’s hands Seiko starts to recover from all his conditions baffling all the doctors at his miraculous results. Seiko gives a heartwarming thanks to his son Kiichi for taking care of him these past two years, Kiichi tells his father that the one who cured him has already left, Minoru is seen walking away with an invitation to the Hyper Battle. Later that night Kiichi bids his father a farewell as he goes to participate at the Japanese preliminaries for the Hyper Battle.
Meanwhile at the sacred Shikabane (corpse) mountain many fighters gather at the preliminaries for the Hyper Battle, among them are many fighters of high renown to the lesser known are fighting for a chance to compete. Kiichi during the extent of 24 hours battles many opponents in order to guarantee a spot in the Hyper Battle, becoming a finalist. Meanwhile, Seiko is shown training once again but he seems to be wracked with feelings of revenge and anger towards Kiryu for what he did to him, and vows to get even with him. After being discharged from the hospital he goes to the apparent resting place of his oldest brother Son-O Miyazawa, who was thought to have been killed by Kiryu many years before and ends up being abducted by a mysterious group of individuals.
Afterwards Kiichi travels to New York City where the Hyper Battle will be held. After meeting up with an old friend he goes to Madison Square Garden where the competition will take place, he encounters many fighters among them Minoru, Kiryu who will do an exhibition fight, his father Seiko who was training with a group called “Team D” and the Japanese Brazilian fighter Mauricio “Jet” Naito who is also a deaf mute. It is at this tournament Kiichi will ultimately have to push the limits of his strength and skill in order to better himself as a fighter and martial artist. He becomes the head of the Nadashinkage school by defeating his father "the quiet tiger" Seiko Miyazawa. It is also revealed during the battle that Kiichi is adopted. During the battle against his father Kiichi pushes his limits once again and masters the Tiger's paw technique, which was previously thought to only reside within those with pure blood of the Nadashinkage since the Nadashinkage is the only clan that possesses the 3 legs, The dragon, The tiger and the Falcon possessed by Kiryuu, Seiko, and Son-O respectively. Kiichi use of the tiger's paw strike to defeat his adopted father Seiko, only raises further questions about who his biological father might be. Kiichi then faces Jet in the finals and although he is being pushed back the whole fight manages to win at the last second by redirecting the energy of Jet's punch to strike back at him, winning the tournament. It is revealed during this fight that Kiryuu is the biological father of Jet, and after the battle, while Kiryuu fights the mob enforces of Gambino and Black heart one of the henchmen gets a clear shot at Kiryuu. The bullet seems to be headed straight for an unaware Kiryuu but Jet jumps in front of the bullet at the last second which pierces him in the throat, it is confirmed in the next chapter that jet has died from blood loss.
|Koukou Tekkenden Tough|
|Main article: Koukou Tekkenden Tough
Kōkō Tekken-den Tough (高校鉄拳伝タフ, Kōkō Tekkenden Tafu; literally: "High School Iron Fist Legend Tough") is a manga, written and illustrated by Tetsuya Saruwatari and serialized in the Shueisha weekly seinen magazine Young Jump. Serial chapters of the manga were collected into 42 tankōbon volumes, released between March 13, 1994 and July 18, 2003.
Viz Media released six volumes of the first manga series under its "Editor's Choice" imprint from January 4, 2005, to April 16, 2006. These volumes omitted some chapters and artwork for graphic violence, and have been discontinued.
|Main article: Tough
Tough (TOUGH—タフ—, Tafu) is the sequel series of manga, continued serialization in the magazine and has been collected into 39 tankōbon as of August 2012.
|Tough: Ryu o Tsugu Otoko|
|Main article: Tough: Ryu o Tsugu Otoko
Tough: Ryu o Tsugu Otoko (TOUGH 龍を継ぐ男, TOUGH Ryū o Tsugu Otoko; literally: "Tough: The Man Who Inherits The Dragon") is the third series. Serialized in Shueisha's Weekly Playboy since December 21, 2015.
|Tough Gaiden: Oton|
|Main article: Tough Gaiden: Oton
Tough Gaiden: Oton (タフ外伝 OTON, Tafu Gaiden OTON) is the side story. Serialized in Business Jump since 2004.
|Main article: Devils×Devil
Devils×Devil (Devils×Devil) is the side story.