A Violence Jack one-shot from 2001. What happens when Jack and some bikers mysteriously get sent back into the age of samurai.

Reincarnated to a werewolf magician, the Protagonist Vyett was instated as the vice head of the Demon Lord's third brigade force. Occupying a remote market town, he was entrusted to management and defense.

"As a former human, born a monster, I can understand the sentiments of both sides well enough. Because of that, those around seem to think I'm a man of wisdom, or something of the like, but it's really just one trouble after the next. I have to follow those monsters that are overly quick to resort to violence, and do something about the humans, who start to complain immediately. So today as well, I'll do my best at managing the Demon Lord's main force."

Official manga page

A peerless master from the mountains and a mysterious jade that can predict the future…

Our MC Lin Yi is an ordinary high school student with a mission: to make the schools top beauty fall in love with him. Furthermore, this was assigned by her father.

Although Lin Yi doesn’t want to deal with the stuck up beauty, it is his elder’s order, causing him to transfer into and becoming beauty’s attendant. Thus, the story of the overpowered attendant becoming the schools beauty’s personal bodyguard was born.

Description from Gravity Tales:
An assassin of legend returns to the cities, fueled with a new calling and a higher purpose- to hit on girls and protect the school beauty!

"I'm her bodyguard, so don't get too close... I wouldn't want the Miss getting jealous again."

From [Fujoshi Bitches]
Narasaki Naoto was born into a family of thieves. After committing a marriage scam, he is arrested and taken to the upscale apartment of elite detective, Oogaki Kaoru.
“I became a detective in order to distort that pretty face of yours.”
As the good-looking Kaoru with a stalker tendency calmly says that, Naoto slowly warms up to him as their peculiar living arrangement starts.
A love story of captivity between a forceful detective x con artist.

Almost five hundred years from now, life on Earth struggles to survive in the aftermath of an apocalyptic war. Beasterians, scientifically created human/animal mutants designed to be strong, disposable soldiers, are now the masters of the remaining humans. Humanity’s one hope is the birth of a savior who will lead them out of the darkness. Before that time can come, however, three angels, all superb warriors, must fight to save the life of the Holy Mother.

From Nakama:

Long ago in a distant land, when the heavens ruled the earth, the two of them met by a trick of destiny...

Called the Wise Man of the Woods and given much respect by the villagers, messenger of heaven Olgrius is searching for the origin of the incessant outbreak of storms. Then a villager, speaking riddles of an attacking beast, appears.

The being that Olgrius sees when he returns to the scene of the crime is a savage beast fallen from heaven. But the beast differs from the rumors, he touches Olgrius gently, and protects him from danger...!?

Mao, who has a rare bloodline of a beast, has gone on a journey to find the "Master" he has never seen. He then meets Syon, a bounty hunter...

6 chapters + 2 Extras

Manga based on the video game of the same name.

Those who have wet their feet in the underground society must pay back sooner or later. When a handsome mafia boss decides to become an elite bodyguard, the game of seduction and anti-seduction begins!

Filgaia’s been going to hell in a handbasket (?) lately, and young Maxi keeps finding himself smack-dab in the middle of it all… And like it or not, he’s bringing the rest of the town down with him! Joined by Guy, an enigmatic florist, and Jechika, a girl with one-too-many talents, Maxi sets out on a non stop, trouble filled adventure!

After World War III, humans and "Artificial People" co-exist in a lawless world. Conspiracies, conflicts, and mysteries surround an innocent love story between a human and an artificial person.

Weiss - an underground group of assassins composed of four men torn by their pasts; Omi Tsukiyono, Aya Fujimiya, Ken Hidaka and Youji Kudo. Each carrying the scars of their memories, they skillfully purge the city of criminals who have either evaded the law or are out of its reach. One by one, they begin to discover the relations of the crimes to something much more sinister, reaching out to their pasts. But each of them must decide if fighting for what they believe in and for the ones they love is worth it when it might come at the expense of their humanity...

Set in the near-future, a little-understood form of matter known as "Mile One" allows a powerful and influential Japanese family, the Gowa, to produce a bipedal weapon which they refer to as a Tactical Armor (TA). At this time, a war breaks out between the US and the fictional Middle East country of Belgistan, much like the Gulf War. When US military forces attempt to seize the capital, they are systematically wiped out by what appear to be rival TAs. The Gowa Family seizes this opportunity to demonstrate their weapon system, and civilian pilot Yuushiro Gowa and the military squad to which he is attached are deployed to Belgistan. There, he meets rival TA pilot Miharu, with whom he seems to share a deep spiritual bond.

From Viz:
Kamui Shiro is a young man who was born with the power to decide the fate of the Earth itself--a destiny he can barely bring himself to believe. But as other players in the prophecy begin to gather around him--the "Seven Seals," with the power to protect the Earth, and the "Seven Harbingers," who are fated to destroy it--he has no choice but to come to terms with his fate.

Note: Re-released under the title X/1999.

NO TRAMA, NO DRAMA, JUST FIGHTING!The destiny of four man, one terrible fate. Who will survive!? Eiichiro, Kube, Noboru and Yoshihiro. PAINT BATTLE VOL 1: ABSOLUTE SHONEN.

[From Tokyopop]:

Kaito Yagami is a florist/gardener by day and a hired assassin by night. He kills using poisons from plants to make money to care for his brother who is confined in a hospital.

Ms. Aoshika is not only divorced, but an underappreciated teacher at her job. But one drunken mishap leads her to witness firsthand the brutal assault and murder of a young man. However, after fainting, she awakens to discover that all of the assailants have been seriously wounded. And to her further surprise, the next day she discovers that not only is the young man, Akira, she met the night before alive, but he is now her new transfer student. This series is based off of a combination of the Wolf Guy manga and novel with aspects from "Adult Wolf Guy "Wolf Guy - Ookami no Monshou" is a modern adaptation of "Wolf Guy (SAKAGUCHI Hisashi)" with a more violent and mature setting.

[From Kotonoha]: While it’s not explicitly mentioned in the story, it’s believed that Suzumega is at least somewhat related to Abara since it features the Gaunas.

Kyouji is a Buddhist exorcist, and although he can't see ghosts, his best friend and lover, Yu, can! Maybe they'd go all the way if Yu's incredible supernatural strength could be held in check. How can a steamy, sexy relationship survive such obstacles?