From Kodanclub:
Long, long ago, a woman who had coupled with a strange beast gave birth to a Saishi, a half-human half-beast creature, whose body was filled with venom. These brutal creatures were used in battle during times of unrest, but during times of peace, they were shunned and hated. Indeed, they were cursed.
A Ronin samurai called Gen Tsukinosuke is one of the few surviving Saishis and the owner of a magnificent sword, the "Fangs of God." He travels in search of his estranged sister and sleeps with women who yearn for death, killing them with his deadly poison. The story takes place in the war-torn days at the end of the Edo period. With a destiny to be a Kaishi, Tsukinosuke is also being swallowed up by the harsh flow of history.

Note: Bestia is the extended version of Ryuugetsushou and contain more content as Ryuugetsushou has three volumes and Bestia has four volumes.

Pronounced - Bee heun From: Easy Going Scans There are some heroes whose names you do not know, whose faces you have not seen... They operate secretly, and their actions can make a difference in the outcomes of wars. Be Huen is the story of such a man. To follow his story, one must search in the shadows, for that is the only place you could find him... Webtoon from Naver Please address this work as a Manhwa (Korean word for cartoons)

Being a hitman for the government is never easy. And then the girl you like turns out to be...!

Bushidou Sixteen centers around two female competitors of another Japanese tradition, kendou (sword-fighting). Kaori is an accomplished kendou practitioner, but she finds herself facing an unexpected opponent in Sanae, a superficially weaker fighter who bests Kaori in a bout.

Two twin brothers Ry and Key were trained in martial arts since childhood by their Martial Arts father, "Rokuu Riley" as they are now young adults a tournament begins in their city and they feel they are called to accomplish something much greater in life. And in their own ways they will not stop until they have succeeded no matter what challenges, threats or obstacles come into their lives.

This manga follows the unfortunate life on an extraordinary swordsman - Inoko Gennosuke.
Gennosuke was born in a social group called 'buraku' that was considered to be the filth of society, and because of that he was forced to live a life of misery.

Note: Cover image is from the 2004 reissue.

The son of the Qin emperor is in danger. The soldiers have cornered him and things look pretty bad for him. Just when he was about to lose hope, a stranger with golden hair appears and saves him and his mother. Follow their adventures as they try to stay alive and unite the land under one ruler!

From Easy Going Scans:

Once... Humans and Orcs peacefully co-existed, but at some point humans got greedy and started a war claiming the Orcs' territory. The diety-Lord who created all, got angry with the humans' greed and decided to punish them with 3 catastrophes. One of them was the "Dragons", divine creatures blessed with magic capable of doing almost anything. Now the Orcs, with a "Dragon" by their side, seem to have the upper hand. Will humans just sit back and see their land get destroyed? They are too devious for that... Their only good plan at that point is to abduct a "Dragon" to even things up. But how are they going to manage the capture of a being with so much power?

Note:Manhwa adaption roughly covers 2 volumes of the original novel Dark Mage (Novel).

This total loser, Tatsuhito, causes the legendary gang leader of the Grand Cross, Shou, to be hospitalized. He must take his place for the duration of time it takes for Shou to recover or else the Grand Cross would fall into chaos.

Born as an aberration different from the expectations of a chief's son, Fei Long has been ostracized by his own people. To prepare for his destined future role as chief of his clan, Fei Long is sent to Japan to complete his schooling and gain experience mingling with humans. In Japan, he discovers not everything is simple.

This manga has been published one volume per year for 12 years, so the artistic style changes rather drastically as you read further on. It's a chronicle of sorts of Katayama Shuu's growth as an artist.

Chaos disturbs Zhong-Yuan (Middle Plain) as Heidi, the Black Emperor, upsurps the throne, yet the rest of Wulin (the Martial Arts World) is as serene as an ocean without a single ripple. Having left Hua Yuan Shan (literally, "Chinese Plain Mountain," presumably a sword school) to attend a martial arts congress, Xin Moyi and Xu Xuan soon make acquaintance with Yue Ling Long, a young girl from Moyue Shan (literally, "Devil Moon Mountain"). She, who will change the two worlds...
A fantastical adventure of martial-chivalry is about to unfold...

199X, nuclear war has ravaged the planet. From the ashes, gangs have risen to take all the power from world governments. Justice has ceased to exist in this now lawless world. From the sands of a desert, a man appears. His name is Kenshiro, and he is the sucessor to the most powerful martial art in the world, Hokuto Shinken. This art attacks the foes insides, and makes them explode internally and die in often brutal ways. Kenshiro's goal is to kill the man who kidnapped his fiance, Yuria. A man that he once called a friend, but who betrayed him and left him for dead. Along the way, he makes friends and enemies alike, while protecting those who cannot protect themselves.

A story about the Shinsengumi.

In one unusual Tokyo high school, education takes a backseat to brawling as warring clubs wreak havoc in the hallways and chaos in the classrooms, all vying to be the baddest team around! Although they often contribute their fair share, only a handful of students serve to stem the tide of violence in this untamed outpost. These are the few, the proud, the powerful: the members of the Juken Club!

The story is set in Japan in the middle ages. Tsujimura Genzo is a puppeteer whose heart has become as hard as stone due to the murder of his beloved wife.

In each story, Genzo brings the dead back alive as puppets, and by doing so, he is able to solve mysterious incidents or help a dead man's soul. Kikuhime, a young "tomboy" princess is Genzo's companion and helps him fight the villains.

[From Peccatore-Sanctuary]: Motoki, who adores the strong Yusa, joined Judo. However, Yusa left for America. Three years later, he returned back to Japan but he became a lousy playboy and also gave up on judo. In order to find out the reason for his change, Motoki challenged Yusa to a match, but while during the match, Yusa suddenly kissed Motoki...

Quite possibly the best and most reknown fighter of all the schools is a red haired girl, solely referred to as the Red Lion. But as the Red Lion suddenly disappears one day, we find that's only the beginning to the trials of real "Red Lion".

Usagi is the granddaughter of the leader of a prestigious ninja village, but she's such a klutz that she's never made it out of the lower class. Frustrated with Usagi's lack of progress, her grandfather sends her to marry Lord Hanzo with an order to breed many ninja children. But the lord has no interest in her or her childbearing potential!

Last volume includes Promise of the Moon.

Kaede, the heiress of the Kisaragi ninja clan has decided to run out on her arranged marriage, and take matters into her own hands. Searching for a companion on her own, she meets the most unlikeliest of guys; a total weakling. However she is soon intrigued by his courage, and chivalry. Can love blossom between these two kids from completely different worlds?