seinen

Let's Lagoon

Yamada is stranded on an island without any ships passing by who isn't sure why he's there because he can't really recall, so after finding his sports bag, he assumes he was on a school trip. With only 7 days of food, he eventually decides to make a boat to leave the island. He thought he was alone on the island until a girl named Imaise Chika was found eating his food, where they then decide to continue making a boat.

Shamo

At the age of sixteen Ryo Narushima was a genius and looked to have no trouble of 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 only leaving his sister alive and cowering in a corner. It is at this grotesque incident that our story begins. Extra Note: At volume 20, the series changed publishers, which created a restart of the chapter numbers.

Sun-ken Rock

The storyline revolves around Ken (the chief protagonist), a guy from an upper class family that was orphaned young because of his family's engagement with all the Yakuza; he became a highschool delinquent known for fighting. The thing that moves actions to be taken by him is through his amorous fondness Yumi, to get a classmate. At the first, the gang did not even have a foundation and solely consisted of few members. As the narrative advances The Sun ken Rock gang becomes larger as new members were recruited by them and take over other gangs' territories and investments.

Tough

This is a mixed martial arts fighting manga about the Miyazawa school of martial arts. Initially, it is about Kiichi trying to heal his father after he was nearly killed by his brother Kiryu. But then it goes on to be less about that as his father recovers and some tournament style fighting begins. At that point various apparently overwhelming opponents will encounter Kiichi on his way to the top. The objectives of the various characters start to play a more and more important role, as well as the different philosophical projections of several martial arts and disciplines.

Usogui

There are gamblers out there who even bet their lives as ante. But to secure the integrity of these life-threatening gambles, a violent and powerful organization by the name of “Kagerou” referees these games as a neutral party. Follow Bak Madarame a.k.a. Usogui (The Lie Eater) as he gambles against maniacal opponents at games – such as Escape the Abandoned Building, Old Maid, and Hangman – to ultimately “out-gamble” and control the neutral organization of Kagerou itself.

Satanofani

A mysterious syndrome turns schoolgirls into homicidal monsters behind numerous atrocities in Japan. However, nothing is what it seems and when Chika Amagi is arrested for the brutal murder of five people, which starts a journey into uncharted and troubled waters!

Risou no Himo Seikatsu

A hopeless otaku with a dead-end job is summoned by a beautiful woman to a different world, asked to marry her and make a child with her. Will he throw his mundane life on earth away in exchange for a lazy life with a beautiful woman he just met?

Gantz:G

A group of high-school students had an accident on their way to a trip and died, but they find themselves in a classroom with a black sphere...

Rikudou

From MangaHelpers: Riku experienced a lot of pain and tragedy in his early life. After his father's death, a former-boxer Yakuza man taught him how to do a basic punch, and that punch saved his life when he had to defend himself from his mom's drug dealer. He ended up taking the drug dealer's life, marking him as a killer. Criminals continued to come after him, leading to more tragedy for the people who attempted to care for him. All of this drove him to ask that same former boxer to teach him to become stronger, which led him to a rundown gym, his door to the world of pro boxing!

Star Martial God Technique

In the whole world there lays twelve paths to climb Tower of Dogs, and in legends these twelve pathways leads toward legendary road of immortality. However these paths in the Tower of Dogs, are far too long, without end. In ancient times there once were many types of martial arts, sadly the world underwent terrible changes, and only three were left: Flame, Dragon and Star Martial Arts. Generations of experts of those three martial arts are searching for the road of immortality. A Star Martial Arts practitioner on his journey of lifetime, plans to become the martial god.

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