Takemichi is a 26-year-old unemployed virgin who learns that the girl he dated in middle school, the only girl he ever dated, has died. Then, after an accident he finds himself in a time leap back to his middle school years. He vows to change the future and save the girl, and to do that he aims to rise to the top of the Kantou region's most brutal delinquent gang. (from MU)

What would happen if you took a normal three-year old Japanese kid, flew him to Nevada, and then raised him on stories of feudal Japan? "I'm Doushirou" would happen. Now, twelve years later, Doushirou is back in Japan and is facing the difference between what he's been told all his life and what his own eyes and ears are telling him.

Fresh out of college, Kumiko "Yankumi" Yamaguchi becomes a math teacher at an all-boys high school. Unfortunately for her, she's assigned by the school board as the homeroom teacher for class 3-D, which happens to be the class of delinquent students. When the class attempts to make a living hell out of Yankumi's career, they fail as her persistence and aggression gain her respect. However, little does anyone in the school know that Yankumi is actually heir to the Kuroda Ikka—one of Tokyo's most powerful yakuza clans.

(Source: ANN)

[PL] Kumiko właśnie została nauczycielką matematyki w liceum tylko dla chłopaków. Dostała wychowawstwo w klasie 2-4, klasie pełnej facetów sprawiających problemy. Jednakże nikt nie wie, że Kumiko jest wnuczką szefa yakuzy, więc musi ukrywać ten sekret, żeby nie wyrzucili jej z pracy.

Wkroczcie w świat niebezpiecznej yakuzy i problematycznej młodzieży!

While searching for a brave candidate to become a magical girl and defend the world from evil, a mythical creature finds Kayo Majiba, a cute young lady who seems like the perfect fit. But when this newly turned magical girl proves to be a crude delinquent who goes berserk in a conflict, it becomes clear that this may have been a terrible mistake. Now evil—and any innocent bystanders—will face the rage of a magical girl gone wrong!

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Maeda is a new student in the Teiken High School. He stutters when he's nervous and he's rather clumsy. He gets noted immediately because he hits a teacher during the entrance ceremony. Some clubs search to enlist him as they see in him a force they can use to get even with other clubs. But Maeda is a loner and has only one dream: becoming boxing champion. His first objective is to beat the leader of the boxing club. "Rokudenashi" translates as "good for nothing".

The manga focuses more on gang warfare than boxing.

17-year-old Iguchi Tatsuya has just been released from juvenile detention and is on probation. He's been relocated to a new area, away from the bad influence of his old friends, and is under the care of his aunt. He is determined not to be sent back to lockup, and he works hard in his aunt's restaurant. However, he still has the same personality, the same tendency to violence, and still falls in with the same sort of people. It's going to be difficult for him to stay out of trouble.

French:
Spoiler

Iguchi Tatsuya vient de sortir de la maison d’arrêt de Nagano. Le juge pour mineur lui a laissé une dernière chance de se reconstruire une vie normale après s’être fait coffrer par les forces de l’ordre lors d’une bagarre sanglante qui opposait la police et son gang de bousoukoku. S’il se tient à carreau, il ne retournera plus jamais en détention, mais s’il est impliqué dans la moindre baston, il y retournera. Les choses ne se passent évidemment pas comme prévu, il va faire des rencontres qui vont le mener à se battre contre les gangs les plus dangereux de Tokyo.

Russian / Русский Spoiler

17-летний Игучи Тацуя только что был освобожден из-под стражи и находится на испытательном сроке. Он переехал в другой район, подальше от дурного влияния своих старых друзей, и находится под опекой своей тети. Он полон решимости не возвращаться в колонию и усердно работает в ресторане своей тети. Однако у него все та же личность, та же склонность к насилию, и он по-прежнему общается с теми же людьми. Ему будет трудно держаться подальше от неприятностей.

Mitsumine High School is known as the school with the most juvenile delinquents in the country. The students are so violent that even the teachers are scared for their lives. Sunahara is the leader of the first years and is the strongest dude of his class. But when the transfer student Asagiri Shinnosuke makes an appearance at the school, he starts taking down names and kicking up dust like a tornado. If the students thought things were violent and unpredictable at Mitsumine, they haven’t seen anything yet since Asagiri is here to become the champion of the school.

I was in despair because of my miserable life. This all changed when I met him. He is my savior, but ...he is also my worst enemy.

Immortal Tatsu is an ex-yakuza who’s given up violence for making an honest man of himself - but is it still possible for a devoted stay-at-home husband to get into a few scrapes?

Russian / Русский Spoiler

Бессмертный Тацу — бывший член клана якудза, который решил завязать с насилием и стать честным человеком. Удастся ли ему оставаться преданным мужем и хорошим домохозяином, не ввязавшись при этом в различные неприятности?

3rd place of Tsugi Manga Awards, Category Webmanga (2018)

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Yoshino has always been treated differently because she is the granddaughter of Osaka's biggest mafia boss, so everyone is afraid of her and she has never had a boyfriend. One day her grandfather tries to engage her with a boy of her age, Kirishima: he is intelligent, calm, kind, and... grandson of another great mobster. In spite of everything, she decides to go live with Kirishima in Tokyo and begins to take an interest in him, but what will she do when she finds out that he is not only part of the Mafia, but is also a masochist?
Russian / Русский Spoiler

К Ёшино всегда относились иначе, ведь она дочь главы Осака - самого большого клана Якудза. Все боялись ее и сторонились, так что у нее никогда не было парня. Все меняется, когда однажды она встречает Киришиму, сына другой семьи Якудза, которог выбрали в качестве ее жениха.

English:
Unoki-kun, a boy who's been bullied since elementary school, ends up becoming the exclusive errand boy of the top delinquent of his school, Toramaru-san, who told him "Be mine" right after entering high school. But the truth is that Toramaru-san meant it as a confession of love!! This is the beginning of a love misunderstanding between Toramaru-san who thinks she's in a relationship and Unoki who thinks he's being bullied.

Portuguese / Português:
Unoki-kun, um garoto sofreu bullying desde o primário acaba se tornando o garoto de recados da maior delinquente de sua escola, Toramaru-san, que falou para ele “Seja meu” logo depois de entrar no ensino médio, mas a verdade é que Totamaru-san estava confessando seu amor!! Esse é o começo de um amor mal-entendido entre Toramaru-san, que pensa que está namorando, e Unoki, que pensa que está sofrendo bullying dela.

Russian / Русский Spoiler

Уноки — парень, над которым издевались с начальной школы, в конечном итоге становится мальчиком на побегушках главной хулиганки школы, Торамару, которая сказала ему «будь моим» сразу после поступления в среднюю школу. Но правда в том, что Торамару таким образом призналась в любви!! Это начало любовного недопонимания между Торамару, которая думает, что она в отношениях, и Уноки, который думает, что над ним издеваются.

Six minors (16 - 17 years) answering to the nicknames of Joe, Mario, Suppon, Baremoto, Heitai, and Kyabetsu are put into a reformatory for offenses such as aggravated assault, swindling, flight, etc. Their stay in hell begins immediately. Accommodated by a doctor pedophile, they are placed under the watch of a despotic and brutal crew. Cellmates with a certain Sakuragi (called Anchan), the tension rises between the band of buddies and their new "friend." A brawl breaks out, and our six prisoners are done rossés by the mysterious young man, thanks to his boxing talent.

The story will not only follow the lives of these seven characters surviving in their hellish environment, but also their disillusions due to the rejection by the outside world and by their close relations. This is about the extraodinary and invincible friendships between these young men.

Rainbow received the 2005 Shogakukan Manga Award for the seinen/general category along with A Spirit of the Sun.

Takahara Jin is a former biker gang delinquent. From the day of his entrance ceremony in High School various problems occur that can get him expelled. From these problems, the power of his arm is noticed and in exchange for not being expelled he must join the baseball club.

This series follows Jin as he looks away from his past and gives baseball his all.

The story of a middle school girl trying to find herself in the confusion of adolescence.

Skateboard-loving Ichiri Sanjou, nicknamed "Icchi," may look like a normal energetic kid, but whenever she sees the full moon, she is hit with a wave of emotion she cannot comprehend.

The series revolves around her learning the Afro-Brazilian martial art of Capoeira.

From the mind of Usogui, Sako Toshio.

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A guy fell in love at the first sight with the school #1 delinquent. He steeled himself and asked her out, but...

Author's twitter

"It feels TERRIBLE to have a brother!"- we both thought.
Until one day, we both made a wish to turn the other into a sister...

Yashiro is the young leader of Shinseikai and the president of the Shinseikai Enterprise, but like so many powerful men, he leads a double life as a deviant and a masochist. Chikara Doumeki comes to work as a bodyguard for him and, although Yashiro had decided that he would never lay a hand on his own men, he finds there's something about Doumeki that he can't resist. Yashiro makes advances toward Doumeki, but Doumeki has mysterious reasons for denying. Yashiro, who abuses his power just to abuse himself, and Doumeki, who faithfully obeys his every command, begin the tumultuous affair of two men with songs in their hearts and no wings to fly.

In 1999, Joutarou Kuujou arrives at the Japanese town of Morioh for two reasons: to meet his illegitimate uncle Jousuke Higashikata and investigate a potentially dangerous Stand user. Only minutes after he arrives does he accomplish his first goal; however, Joutarou finds that Jousuke is not only a much younger high school student, but he possesses a Stand of his own called Crazy Diamond. Not long after their meeting, the two make a startling discovery: someone is using a supernatural bow and arrow to create Stand users around Morioh.

When Jousuke witnesses the threat that this poses, he resolves to protect his town and stop the spread of lethal Stand users. Finding both allies and enemies among these users, Jousuke learns just how much one's personal interests and ambitions can be reflected in their Stands, and the resulting harm or virtue it brings. As they continue to investigate, they begin to unearth the shocking history of Morioh, bringing forth hidden dangers and a mystery from years past.

Choi Gang Bae is well known for being a delinquent, even managing to be the top dog in a school full of troublemakers. But when he finds out his beloved sister is being bullied in an all-girls school, he protects her the only way he can; by becoming a girl.

Officer Shibata Taketora works in a local koban (a small police office). He may have a child-like face on the outside, but he's more serious than anyone in his pursuit of justice! With his goal being to become a detective, Taketora confronts everyday problems that happen within the town! Various incidents within the street make him chase after and apprehend criminals!

Rokudou is a loser, and everyone knows it. He gets picked on at school, gets snide looks from passersby, and can only muster up the courage to complain in secret with his equally hapless friends. Looking to turn his life around, he desperately uses an ancestral artifact passed down in his family for generations: a scroll that is capable of subduing all demons. However, in the modern age, it has a different effect: it makes all bad girls fall in love with him.

Born in a family of delinquents, Nanba Tsuyoshi is expected to succeed his older brother as the strongest delinquent in school. Unbeknownst to his family, however, he decides to enroll in the top high school in town to live as a normal high schooler. Can he maintain his double life as the strongest delinquent in town and as a normal high schooler?

Three childhood friends meet again in high school. Hayato (braided hair) the crazy one, Kenji, the big one who wouldn't hurt a fly, and Tomoki, the solitary one, are the main characters of this fighting manga.

Yue Yao, AKA Bai Fei, is disguised as a man and hiding among the largest underground family in the city — the Ling Family — to become the Young Master's right-hand person. Using her identity as a 'brother,' she became acquainted with the carefree Young Master Ling Ye, until a particular assignment arrives where Ah Fei, who is dressed as a woman, couldn't resist her own inner desires and kissed Ling Ye while drunk...

Class representative Marui, an ordinary high school boy, finds Hachiyo face-down by a river bed. Even though Hachiyo was regarded as the school’s strongest delinquent, Marui secretly has a crush on her. However, when Hachiyo wakes up, she suddenly can’t remember anything about herself?

A shy, bashful, and nervous girl tries to survive in a high school for delinquents. The "abnormal" comedy begins.

Akira Kongou is looking to take down the "23 district project" which involves "Banchous" from 23 districts of Tokyo fighting for the right to control Japan. Without meaning to, he becomes a participant with the alias Kongou Banchou and must take down other banchou while searching for the leaders of the project.

Yuri, a college student, is saved by Ouya Toshiomi, the young leader of the Ouya group when she’s being forced into consuming illegal drugs at a party. Since then, even though she doesn’t want to get involved with the internal dealings of the Yakuza, she can’t help but fall for Toshiomi’s surprisingly gentle smile. This is the story of two people who are attracted to each other, but the courtship of a man who lives staking his life may be too fierce and crazy… “Yuri, it might be our last night, so let's get crazy together.”
The most dangerous love ever, begins.

Author's Twitter: @ishigamiakira_k

In a city where the law has been rendered non-existent, Yuki and his best friend Tetsu break into the offices of the Seidoukai to steal in a desperate attempt to finance his ailing brother's hospital bills. They ultimately fail but instead spark the interest of the mob's young leader, Kazutaka Hyodo, who offers Yuki a deal he can't refuse: pay him a visit at his office once a week and all hospital bills will be taken care of. Yuki accepts without hesitation and in order to keep his end of the deal, starts paying Hyodo the visits he asked for...

Tsukasa Kiriki is a boy that comes from a rich family. He spends his life sheltered from the outside by his parents undetermined to change. That is until his homeschool teacher, Mrs. Michie, says something that gives him the drive to be a delinquent. These are how he spends his days as a Bousouzoku.

This manga ran for 22 volumes from 1988-1996.

Link:
AnimeNewsNetwork (anime)

The story revolves around the lives of two rough-and-tumble high school friends Kato Hiroshi and Nakama Toru, who seemed to make a habit of getting into trouble and starting up fights. In keeping with the spirit of the manga, Toru and Hiroshi sport slicked back 50's style ducktails and adopted exaggerated swaggers that made them comical and yet also oddly cool. The drama also features an assortment of outlandish characters who sport even weirder fashions and hairdos. To describe the action in this drama, think Fight Club meets The Breakfast Club.

Link:
AnimeNewsNetwork (OAV)

When a fiery yankee named Sudou Ayame suddenly confesses her love to Kazami Nagi, he literally can't resist out of fear for his life! Now with their relationship established, Nagi begins to learn that Ayame is more of an innocent maiden than he originally would have thought and subsequently, his own feelings for her may began to blossom too. Well, that is if he can survive Ayame's rough personality and her overbearing delinquent friends as well!

Kirara is seen as a cute and girly boy by others. However, he wants to be a cool and manly guy! So when two tall and cool boys move in nearby, he starts to follow them around to learn how to be manly. As they grow up together, Kirara realizes that his feelings towards the younger brother, Ken, isn't just simple friendship.

Follow the adventures of Zack, a crazy boy with even crazier strength who loves to fight! What starts out as an innocent boxing match soon leads Zack into the world of invincible demon-possessed teenagers, acid-spewing mutants, and craven, bloodthirsty cultists! If you're looking for a manga that just bleeds insanity, then you've found it!

Nishikado Taketora is a high schooler with piercings, blond hair, and scary facial features. Even though he only wants to be normal, he keeps getting involved with yankees. Despite of all that, this fierce tiger spots someone that's totally his type!

Tsubaki Sadamitsu is a young punk and Leader of the Corpse Gang who, after a chance encounter with an alien robot, is forced to take up the task of capturing rukeitai (intergalactic criminals). His job is made harder with the appearance of the Vulture, a last ditch effort to keep the rukeitai under control.

Now, the corpse begins to tell the truth of the case
It can be said that it is a common sense in the current investigation "Prosecutor" However, this way of thinking had already been implemented in the Edo period. At that time, there is a book called "Regular Recitation", which was said to be the Bible of the Prosecution. The genius concentricity Kitazawa Hokenjo Kitazawa Hokentaro who investigates this in detail in one hand and lets you tell the truth of murder with one hand. There was no one with the technique of the public prosecutor's office, and he went out to the field like him and changed Kitazawa, which examines corpses casually. Such Kitazawa is helped by doctors and women who love doctors, Genkai, and a female painter, the moon. The three are skillful teams that solve difficult cases with the look of Genkai, and the skills of the moon, which looks at the face of the life from the wrecked corpse and looks like a face.
Well, this time a suicide and a dead body found at the bottom of the well began telling the surprising truth in this team's examination. What is the voice of the corpse of the well? Can Kitazawa find the true culprit?
Rie Takase paints a novel by Ryoichiro Kawada, who won the Edogawa Ranpo Award, with a beautiful brush.
Chinese
Spoiler

倾听死者们无杂念的声音！
北町奉行所的捕快北泽彦太郎与其他捕快们
对令人讨厌的验尸有着别样的热情，
以验尸宝典《无冤录》为依据，他和医生玄海、
画师阿月从尸体身上的小细节入手，真相逐渐浮出水面！！

Yataro Sarumaru, nicknamed Saru, is an ace in the locksmith trade and is obsessed with girls. This (almost) average teenager is given a hardly ordinary mission which marks the beginning of his adventures!