Manga about this

http://en.wikipedia.org/wiki/Little_Fighter_Online

and this

http://www.littlefighteronline.com/

maybe....?

http://www.lf-empire.de/en/lfe-v90/lf-empire

In the modern age, there remain many martial art clans from long ago, all of which are vying for power. Amidst a fight, the son of a security man meets a mysterious girl who kisses him out of the blue...

From: Easy Going Scans

The country of Greenland, after losing the war to the Imperial Army, were in agony and despair for what will the future bring them. They had hired mercenaries to help them during the war and now they've come back to collect their reward while the country were still picking up their pieces of their broken dreams. By that time, the King has passed away and his heir was still too young to take up on the throne. After hearing the news of the King's death the mercenaries decided to take over the throne and rule in his place. But there was an obstacle in their way... The Oracle!

Heisuke just came into town and the first thing on his to do list is chasing pretty girls, which causes him to get punched in the process. After reaching the house he'll be staying at he sees a girl trying to sneek inside. Seeing this as a perfect opportunity to legitimately grope a girl, he attempts to stop this intruder only to find out that it's the same girl who punched him earlier, not only that but her name is Umi and she just happens to be one of the three sisters who live in that house along with their mother. The next day Umi finds out that Heisuke is a boxer who's skill is only eclipsed by his letcherousness.

From ShoujoMagic:

Karate girl Seri tries to kick away her past in order to catch a new guy at a singles party, but Tamaki, a childhood flame from her old karate dojo, shows up to show off and makes her heart pound. Their reintroduction leads to a karate challenge, and if Seri loses, she must become Tamaki's "toy"...!? It's a game of love with more rivals and obstacles (and sex!--LOTS of SEX!) than either Seri or Tamaki could have foreseen!

Includes extra stories:

(Vol.02) Virgin Beast - Dumped for being a virgin, Katsuragi Mio decides to ask Virgin Killer, Tsukahara Masaho for help.

(Vol.03) Scarred Innocence - Naive Moeka wants to fall in love but Kamiya Shun might not be the nice guy she thinks he is.

(Vol.04) A Girl's Mischief: Love's Supreme Principle - Renai Shijou Shugi sidestory.

(Vol.05) Rescued Letter, Complicated Love - Nozomi delivers a love letter to Shigeyama Itsuya from her friend but...

(Vol.07) Ribon

(Vol.08) Flower of Despair, Thorns of Pleasure - Renai Shijou Shugi Sidestory. Takarai Kou's point of view.

In 1800s Japan, after the arrival of the "black ships," a group of young "Roushi" (lordless samurai) answer a call to Kyoto to protect the shogunate. But when they arrive, they find that the political situation, and their role in it, is far more complicated than they first imagined.

Sakura is an incredible kendo fighter who uses an abnormally short shinai. She regularly trounces boys who underestimate her skills. One day two kendo fighters, even stronger than her sensei, attack her dojo asking questions about someone called Narukami Koharu. Apparently, there is a lot Sakura doesn't know about her family history, and it could very well get her killed. Now, Sakura must try to live up to her father's legacy.

From Illuminati-Manga:

A kunoichi, Henpukumaru, awakens in the mansion of her enemy. She is introduced to the future lord of the mansion, Chiyozuru. Chiyozuru is able to get the unemotional Henpukumaru to smile and react differently than she normally would. But then Henpukumaru's former allies attack one night...

Early one New Year's morning, the rounin Senou Souichirou appears in Edo's Katagi tenements.

Initially, the inhabitants regard him with fear and suspicion: Kankichi, the carpenter's son, thinks he may not be human; the neighbourhood cats remark that he reeks of blood. But soon Souichirou pawns his sword, and, with a bamboo replica at his waist, settles down to a quiet life as the neighborhood school-teacher.

Months pass, and all appears to be well. But trouble will not leave the Katagi tenements alone ...

Note: Won the Grand Prize at 15th Tezuka Osamu Cultural Prize in 2011.

Based on the game and inspired by Norse mythology. Lenneth Valkyrie must find the souls of people who die tragic deaths, shape them into powerful warriors post-mortem, and send them to Valhalla for the final apocalyptic battle between the Ƴir and Vanir, Ragnarok.

From Infinity Studios: Having been born in a secret government laboratory that cultivated esper (telepathic) powers within humans, Shuuichi and two sisters, Sumire and Katsumi, are forced to endure a difficult life as test subjects until their escape. Years later, these siblings are still being sought after by unknown organizations that are after Shuuichi powers as he is what they refer to as the “zero-sample” with the ability to cause “zero-shock.” Scanlated by Helz0ne http://helz0ne.zone-anime.com

Only the strongest woman is worthy of being Queen. On this continent, a desperate struggle to crown the new Queen is held every four years. The Queen's Blade.

A oneshot story about Kenshiro's sifu Ryuken and also the other adoptive brothers. Elaborates on how he chose the Hokuto Shinken successor and the events related to it.

Yasukuni is the heir of a distinguished family, one that prizes masculinity and stoicism. He also happens to be crazy about one of his private instructors, Kiyoi. Among the many lessons Kiyoi gives him is the art of sexual pleasures. However, Yasukuni wants Kiyoi to make love with him earnestly, not just as a form of instruction.

Majima Rei is a practitioner of a martial art born from the battles in the Sengoku era, the Jinnai style jujutsu. During middle school he was a delinquent but, when he became a highschool student, he swears that in order to surpass the one said to be the strongest practitioner of the Jinnai style in history, the 8th head Jounouchi Masashi, he will become the strongest martial artist in the world. For that purpose, he battles against various types of martial arts and fighters.

Ever since middle school, Suzuharu Sakudou has never won a competitive kendo match which makes him want to quit kendo in high school. But, he reluctantly keeps on doing kendo simply because he can't say no to his childhood friend, Chiko, and all of his senior in the kendo club. After hearing this from Chiko, Kiki Asahina, a retired kendoka who used to be the country 2nd best in the middle school level decide to beat some sense into him. However, Suzuharu actually defeats her. Amazed by his potential, she offer herself to coach him and entrust her dream to become number one in Japan to him.

To celebrate the upcoming live action movie, Nobuhiro Watsuki reinvents the classic Rurouni Kenshin manga with all-new twists and turns.

Action, romance, and historical intrigue abound in Rurouni Kenshin, the tale of a wandering swordsman during Japan's chaotic Meiji Restoration. Join Kenshin, Kaoru, Yahiko, and others as they take up their swords once again!

Bazalta is a combat association, in which the combatants, or Rankers, are ranked according to their strength. The higher rank you get, the more wealth, fame and power you get, and you may even get the ability to change the world. In short, in Bazalta, "strength is everything". Zig, a young boy from Cantalera, a wandering tribe where fighting and wanting to become stronger is prohibited; after his father fell victim of some monsters, decides to train against the tribe rules, and seeing how despite his training he couldn't save the inhabitants of the tribe from the monsters, he decides to set off on a journey to join Bazalta and make his way to the top.

The decade is the '90s, and fighting games are taking Japan by storm. Against the backdrop of this fighting game frenzy, gamers gather day and night at the arcades to test their mettle. And amidst the fervor, one boy meets his destiny...An exciting young adult comic about the youth of Japan's first professional gamer, Daigo Umehara, is about to unfold!

King of Fighters Kyo: Based on the 2D fighting game series King of Fighters. King of Fighters is a battle between the strongest teams of 3 in the world. The story revolves around Kyo Kusanagi one of Japan's team when they reach the end of the King of Fighters '95 tournament and what follows after they get back to Japan. King of Fighters 2000: Based on the 2D fighting game series King of Fighters. King of Fighters is a battle between the strongest teams in the world, the teams are composed of 4 since the King of Fighters'99 tournament, also the hero since KoF'99 has changed to K'. The story follows K' starting from 9 months after KoF'99 and his entry into the King of Fighters 2000 tournament. King of Fighters 2001: Based on the 2D fighting game series King of Fighters. King of Fighters is a battle between the strongest teams in the world, the teams are composed of 4 since the King of Fighters'99 tournament, also the hero since KoF'99 has changed to K'. The story resolves around the KoF'2001 tournament. King of Fighters Zillion: Based on the 2D fighting game series King of Fighters. King of Fighters is a battle between the strongest teams in the world. This series happens after the fight against Yamata Orochi at the KoF'97 tournament. It revolves around the disappearance of Kyo and Iori and N.E.S.T.S.'s connection to it.