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

Russian / Русский Spoiler

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)

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.

Arabic / العربية
Spoiler

Toile is a WEB Yuri Anthology.

An infamous yankee, Kurokawa Morio meets a partially blind girl, Akaza Yukiko.

PT-br:Spoiler

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!

(en-US)
Daichi is a college student who has finally fulfullied his dream of moving out and living alone. However the one who is waiting for him at Sakuranosaki Heights is a delinquent like landlord? ! Though her expression is scary, she is a landlord that is good at looking after others. Because of this, the otaku life Daichi has always dreamed of takes a step in an unexpected direction?!

(zh-Hant)Spoiler

(en-AU)Spoiler

For the sake of his family, Tosu Tetsuo must go against a crime syndicate, by all means necessary.

Portuguese / Português: Spoiler

While trying to save a child who was going to be run over by a truck, Manai Zero loses his life. When he wakes up even though he should have lost his life, Manai is given the choice of being reincarnated, but in a different world, with a power called "Beloved by Spirits".

A world of magic and sprites, monsters and adventures!

He’s the school’s top delinquent. Just like the devil, that boy would always torment me and giving me nothing but trouble. That was until one day when I cursed inside my heart in irritation, that delinquent soon got into a car accident and passed away. I felt guilt over his death ever since that day. However, one fateful night, I woke up from a nightmare and what greeted me was a pair of glaring eyes that undeniably belongs to that devil delinquent?! Wait a minute, how come he’s in the size of a doll?!
"Hey. The one who cursed me was you, right?" Even if you say that to me, you're not even scary at all. In fact, you’ve become cute instead.
The delinquent and the girl who seeks to reverse this situation. This is their sweet, war-like, fantasy romance.

When Mermaid Princess Era's fish friend is captured and turned into a delectable meal, she goes to land to mourn his death and aid his passing into the great beyond... If only that was the end of the story. Follow Era as she discovers the wonders of seafood.

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Links:

Official Italian

Official Thai

People have been created that are human-animal hybrids, and powerful businesses bet on the outcome of their duels. College student Nomoto Yuuya's casual acquaintances ask him to drive them around to pick up girls one day, which he soon finds out means by force. The girl they kidnap is an animal-human hybrid named Hitomi, who slaughters all of them except Yuuya. Hitomi is a honey badger, which has been called the most fearless of all animals. Now Hitomi is assigned to stay with Yuuya, for his protection!
Killing Bites are underworld duels between human-animal hybrids. One beast who knows no fear will fight in this animalistic world full of fear and insanity. This ultimate battle of the beasts will shock you to your core!

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Links:

Shinya Murata's Twitter

Sumita's Twitter

Anime on ANN

The story follows the high school delinquent Masaya Funebashi, better known as "Devil Ma-kun" who is trying to reform his image by joining the tea ceremony club.

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)

In 1999, Jotaro Kujo arrives at the Japanese town of Morioh for two reasons: to meet his illegitimate uncle Josuke Higashikata and investigate a potentially dangerous Stand user. Only minutes after he arrives does he accomplish his first goal; however, Jotaro finds that Josuke 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 Josuke 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, Josuke 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.

Death decides to give his youngest son his first-ever task, but instead of taking a life, he has to protect one instead. The problem is kai has never been to the human world and doesn't know how to act like one either. This means someone's got a Grimreaper as a bodyguard.

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.

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.

Everyone knows women are tricky beings, with layers upon layers of secrets they hide, but there are some secrets women must risk everything in order to keep hidden! These women with such hidden secrets are being revealed in the series, "Dear, Only You Don't Know!"

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.

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!

Other links:

Author's Twitter

Official English release on Amazon

September 11, 197x, In the whole Kantou region a magnitude 8-9 violent earthquake occurred. Scholars called it the great destruction of the Showa Era, but the people called it the earthquake from hell! Volcanoes erupted, buildings crumbled, Tokyo became decimated in a single day. The government, after failing to recover the city, abandons Tokyo and moves the capital. The survivors form a society with no laws. In this harsh lawless world emerges Jack, a 10 foot giant who annihilates anyone and anything in his path. The manga details his journey.

The numbering is from the Complete Edition, with around 20 Chapters per volume.

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.

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Portuguese / Português: Spoiler

Russian / Русский Spoiler

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
Spanish / Español: Spoiler

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

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Links:

Author's Twitter

High school yankee Akamatsu regularly picks fights with Seven, a strong homeless man who lives in the local park. Fighting Seven is the biggest thrill in Akamatsu's life, so when it seems like Seven may have to leave the park, Akamatsu suddenly invites him to share his house!?

The domestic adventures of two handsome yankees living in a small apartment… BL writer SHOOWA and Shonen mangaka Okujima come together to deliver a uniquely exciting story!

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?

Since the graduation of the senior members of the club, Takezou ends up being the sole member of the "Koto" (traditional Japanese string instrument) club. Now that the new school year has begun, Takezou will have to seek out new members for the club, or the club will be terminated. Out of nowhere, a new member barges into the near-abandoned club room, demanding to join the club. How will Takezou be able to keep his club alive and deal with this rascal of a new member?

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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Links:

Author's Twitter

A salaryman's life gets turned upside down due to a dramatic tragedy, and now he is going to have a summer adventure the entire city will never forget.

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

In a little town near Osaka, an old tradition is being perpetuated. Every year, for hundreds of years, the men of the town defy each others in the "grand ceremony of Masuraou". Their weapons? Their courage and their fists! Their goals? Becoming the the king of the town!

It's in this atmosphere that Takeshi Yamato, a young high schooler from Tokyo, moves in. Ex-gang leader decorated with an incredible secret, he is decided to forget the past and become a socially acceptable guy... However, between his secret being found out, the fights, the girls and the messing up with his friends, he is far from becoming a model high schooler!
(Source: MU)

In the 80s, Kaze Takashi's parents moved to a quiet area in Tokyo to protect their son from the bad influence of his friends. In class, Takashi doesn't wait to make new friends. Passionate for motorcycle rallies, they invite Takashi to join the next event. It became a revelation for the young man and he decides to join a biker gang! Now all that's left is to find a motorbike...

In the world of Kouhei Horikoshi's Boku no Hero Academia, nearly everyone in the world has powers known as "Quirks". Normally, the law enforces the rule that citizens cannot use their Quirks out in the open, and that privilege is reserved only for registered superheroes. However, a select few have chosen to reject this rule. They are known as vigilantes - people with the hearts of heroes, but the reputation of villains.

This is their story.

Portuguese / Português: Spoiler

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Links:

Horikoshi's Twitter

Betten Court's Twitter

An unknowing Sudou Kaname is invited to try out a new mysterious mobile app game called "Darwin's Game", but later realizes that he's in for more than he's bargained for when he finds out that there's no way to quit the game.

Ever since high school, Sang Hwa has had a crush on his seemingly perfect best friend, Ryuh Han. Feeling both inferior and lonely, he delved into Lessa, an MMO slowly declining in popularity and an escape from Ryuh Han.

In game, he stumbled across newbie "Mighty Mirae" - real name Gwon Lee Gum - and the two become fast friends as "Idealize"/Sang Hwa helps to train him and invite him to his guild. Yet, Mirae hyung still remains a distant, mysterious person until they decide to meet in real life.

"Idealize?"

"Yes...? Uh, Mirae hyung?"

No way, is this gangster really that hyung?!

A story about an ordinary boy named Mekh, whose life is about to change the moment he accidentally hit the infamous and easily-misuderstood girl named Saran.

A "delinquent" who freezes up and says violent things when around women meets a small girl in the library when he's out studying. To his surprise, she tutors him, even though an elementary student shouldn't be able to. As it turns out, she's a high school student and his classmate; she's eager to befriend him. Also surprising to him is the fact that he isn't afraid of her. Could it be because he sees her as a kid? Or does he?

A guy decides to pretend to be a delinquent to get people to leave him alone. A girl who was a delinquent decides to act like an honor student because her parents asked her to. This is their story.