Otokojuku - a private school for juvenile delinquents that were previously expelled from normal schools. At this school, Japanese chivalry is taught through feudal and military fundamentals. Similar to an action film, the classes are overwhelmed by violence. Only those who survive it become true men.

from Renta!

From Intercross & Shoujo Crusade:

Chika has always seen Murasame-kun as a rival who manages to constantly piss her off. While wondering out loud to herself, her sister whom overhears Chika, gives her a perfume necklace which supposedly able to capture a guy's heart. The next day, Chika bumps into Murasame-kun and spills all the perfume. As she begins to apologize, he suddenly asks her out?!

From Anime Waves:

Meet Shizuki Maku - to say she looks "above average" would be a slight overstatement, but it's especially bad compared to her older twin brothers, the high-school heartthrobs Retsu and Tetsu. She always wondered whether or not she really belonged in her family, but things take a shocking twist when her brothers plant the suggestion that they may not be related after all.

Now she's supposed to pick one of them to be her boyfriend, all the while defending herself from all the other girls at school who want to keep her "brothers" for themselves! Life isn't easy when you're the ugly duckling!

Sonnan Ja Nee Yo received the Shogakukan Manga Award for shoujo manga in 2006.

Having lost the Sword of Light in the previous battle, Lina and Gourry continue their journey in search of a replacement weapon. On the way, the two of them meet up with Amelia and Zelgadis in the kingdom of Luvinagard while taunting some pirates. Lina is happy to reunite with her old friends, but appearing before her is Luvinagard's Inspector of the Special Investigative Unit; a man called Wizer. However, Lina is amazed at his unusual behavior...

Eight short stories:

1. Box Seat
About the silent exchange between a man and a woman on the train.

2. Kanojo to Kare (Boy and Girl) (3 parts)
A seductive beauty gets entranced by the strait-laced school boy who helped her out.

3. Thank You
A man in black perfoms his incredible choreography on the train.

4. Motto Motto...! (More...and More!)
About the encounter between an art student and his muse.

5. Hana Seigaku Kan no Hi (Heavenly Home Ec)
Visit the most popular maid café in town and meet lots of beautiful girls and one unusual maid.

6. Aoi Udedokei (The Blue Wristwatch)
What is a man to do when he gets hold of a wristwatch that is said to enable its first-time user to rewind the past ten minutes?

7. Hana Chibo (Five-Fingered Flower)
An extraordinary case of pickpocketing disrupts a town's peaceful everyday life.

8. Haruhiko Kikou (Haruhiko the Eccentric)
In a rural village, pair of siblings decide to accomodate a travelling mystigician.

From Shoujo Crusade:

Miyako's living her life diligently following rules, just as her deceased father wanted her to. But one day Azuma Koutarou sees her play guitar and blackmail her to join his band. How will she face it up?

There's also three extra stories that are unrelated to the main one.

Tatsuhiro moved to Tokyo to attend an art school and start his new life. In his new room, there’s a small hole in the wall. At first he can see nothing through the small hole, but one night, through the peeping hole, he saw a girl. That’s how his new life starts.

For fighting and humour fans Jo Pae, a not really sane boy, in our modern days, he wants to become emperor of Korea... His first step when he enters high school is to become the leader of the strongest school there is. No one expecting it, he actually takes down all of the school's yankees. Jo Pae is now the enemy to kill! All rival schools wants his head whatever the means!

Without doing much research on the school or surrounding areas, Hibino Ryouichiro picks an art school in Hokkaido. Tricked by the school advertisements, he goes to the campus only to find out it is a desolate and cold campus. The only glimmer of happiness for Ryouichiro are the girls on campus. Just hours after meeting Kisaragi Riho, the cute girl on campus, she seduces him only to find himself outside naked after she is done with him. Feeling heartbroken and used, he finds comfort in Aso Tomoe, who lives on the floor below at the dorms. Although it is freezing outside, it is hot underneath the sheets for Ryouichiro.

A cynical romance, 'Have you been addicted to love?'

Manga adaptation of the game Phantom Brave.

Chroma are bounty hunters for hire that deal with all manner of requests, including monster subjugation. A thirteen-year-old girl named Marona lives on Phantom Isle after losing both of her parents at a young age. Her parents had lost their lives during their jobs as Chroma and now she must become a Chroma to earn money. However, work as a Chroma is difficult and many hold her in disdain as the 'Cursed Girl' because of her ability to talk to and manipulate phantoms.

Thankfully, she's not alone since she has the help of the phantom named Ash, a friend of her parents that had died alongside them in a mission. Marona's parents' dying wish for Ash was to have him protect their daughter. Now Ash does everything he can to help defend Marona from the hardships of the world.

Rinne, a huge fan of Buddhism, was searching for a "monk-type," a boy as calm, intelligent and diligent as Lord Buddha himself, when she set her sights on a young, handsome monk-in-training, Yuuryou. She soon learns that this kid, out of his robes, is not her dream boy, but a shallow, irresponsible lady killer who goes by Yura. Is Rinne going to give up on her fantasy, or is there more to Yura than meets the eye?

An action comedy about a school for training Yakuza

From Shoujo Crusade:

1-3) Lovers in Conflict
Because of her sister who suddenly ran away, Sagiri ends up getting married in her place. Her husband is hard to understand and is a bit of an S. What will happen to their married life?!

4) Wild Rose's Crown

The sequel to the Shaman King and Shaman King Kang Zeng Bang series. Takes place 10 years after the end of Shaman King Kang Zeng Bang and focuses on the life of Hana in his teenage years.

Imagine a senpai you don't get along with. Then imagine having to work with and live in the same apartment as him! With no vacancies in the single's dorm, newbie cop, Kaitou, has no choice but to move in with his senpai from the koban, Himuro. While he's beautiful and excels at his job, Himuro has a mouth on him and he and Kaitou fight like cats and dogs. But then one morning, surprise! A sudden embrace and a kiss!

"Give me back my first kiss!" Romance, trouble and a love triangle. A fiercely tsundere senpai versus a hot-blooded rookie equals a workplace romance!

Vampires have evolved and don't rely on human blood anymore. They now co-exist secretly as normal citizens even though they are still feared and discriminated against by the society. So what happens to a female vampire trying to live a normal school life when she meets the most popular boy in school and accidentally nips his neck?

From MangaHelpers:
Before they enter high school, the boys Meguru and Shou are whining about the fact that neither of them has a girlfriend. A strange, large-breasted woman shows up, claiming that she will fix their problem, and kisses Meguru. This odd occurrence is pushed out of the boys' minds when they meet up with Souko, a friend from elementary school, who is going to be in their high school. She's grown up into a pretty young girl, and it seems like the boys might have a shot with her!
That evening, Meguru realizes that the strange kiss may have had more meaning than he thought: he's turned into a girl! He convinces Shou and his mother of his identity, but no one has any idea how to turn him back. Now he's going to have to learn how to be a girl and let go of his hope of dating his cute childhood friend Souko. What will happen to his hopes for a popular high-school life?

A story about a demon hunter named Rano who is trying to find his sister. Along the way he finds a person who has the same teeth structures as demons yet is not affected by sunlight. This person, Lessa, seems to remember who Rano is, but Rano does not remember who he is. Rano only dreams of this person; what are the connections between these two?

Three years ago, Karamura Neneko's father died. Since then, she's been living together with her older sister, Nanako. They've been living together happily until recently, when Nanako starts acting strangely. There will be nights that she doesn't sleep at home, and then one day she completely disappears. Not only that, but she quit her job at a company that she had been at for a long time.

Worried about her sister, she remembers a place that her father told her to go to if she was ever in trouble, the Raubritter. Upon arrival, she meets Shinobu and Yokana, cousins that run a detective agency, more-so as a hobby than a career. Since they are both fairly wealthy they never ask for payment. They only help young maidens in need, and since their business is a secret, only people with connections come to them. It turns out that Neneko's father helped them out a lot in the past. The cousins are heart broken to find out that he died, so they are more than willing to help Neneko find her sister.

What has happened to Neneko's sister? Will a special relationship develop between Neneko and the cousins?