Rose Hip Rose is a manga about a teenage girl who fights crime. While the setup doesn't sound so great, it gets better as the manga progresses. The series' major strong point is the art. Along the way, she ends up having a showdown with a major criminal named The Goat. However, it seems that The Goat doesn't seem to like being caught. Be wary, though, the series is very violent.

The art and story are by Fujisawa Tohru, author of GTO and Bad Company. The art is quite nice, but somewhat different from GTO's. If you like violence, gore, Fujisawa, or cacti, Rose Hip Rose is the manga for you. Oh yeah, did I mention it was violent?

Reprint contains Magnum Rose Hip as volumes 3-4

From Café Scans:
Koume, who has always admired the rumored "princess carry" is in her first year of high school.
On her way to school, he meets a boy, Daisuke, who's extremely athletic, but extremely small. The only thing big is his attitude. Our first impressions suck! Plus, we're in the same volleyball club.
I can't believe it's with Daisuke, or so I thought, but my heart won't stop thumping hard. What is this?

Yagi Meiko is a sophomore lonely girl who becomes a blogger from having admiration for Madeleine blogger who has become an idol in the whole network. One day Yagi Madeleine discovers that Madoka is a girl Kirara first year of school and begin a beautiful friendship, everything seems fine until appears on the scene Koko-chan a somewhat psycho girl and her friend Alice childhood, which cause an entire shock ...

From Chibi Manga:

Minako entered in the same high school as her nephew Shuu. And then she figured out that one of her classmate is the guy she loves: Takuma. She will have to make a choice between love and friendship.

Included in this manga is a two chapter short story called Sakura no Kioku in vol. 2:
Her graduation ceremony is approaching. Because she wanted something else, she decided to break up with her boyfriend, but...

Contains several oneshots.

(1) ...Reverse?!
(2) Poltergeist of Love
(3) 99 Percent of Me is My Face
(4) Please Get The Kitten
(5) Libido of M
(6) Love Serviceman
(7) What are this Feelings?
(8) A Healthy Body is Necessary to Fall in Love

Six years ago, following a crushing defeat, a group of friends promised that they will one day take their friend Suzuo to the Koshien. Now in their first year of high school, the friends have reunited behind the pitcher Kitaro Kitaoji to keep their promise. With Suzuo as their manager and Kitaro's signature left-handed, underhand "Submarine Pitch," they may just go all the way.

Won the Kodansha Manga Award for Shounen in 2008.

Yazawa Himawari, a normal student, dives into the world of ROCK...!? A collaboration of Vocaloid Producer and Artist, "HIMAWARI★ROCK YOU!!", a web manga, gain good reviews. -from MIRΔISONIC's youtube channel- 

From Chibi Manga:
A girl who wants to love fell in love with a impregnable guy who refuses to love…
The club activities was everything for Yuka during Middle School. But now, in High School, she will definitely get a boyfriend. She’s very excited about it, but…?! The future of their bipolar love is?!

Sidestory of Seitokai no Ichizon.

Hekiyou Private Academy's student council members are decided through what basically is a popularity contest. Since good looking girls are admired by both sexes, unlike boys, the student council room became known as paradise. As the pillar of the student council, Sugisaki Ken seeks to create his own bishoujo harem due to his love of girls.

From Nekohana:
Ako Doumoto's an everyday gal, or gyaru; she likes shopping and has no big aspirations since her exams are a ways away. That all changes when she meets Katayose-sensei, a teacher and coach of the boys basketball team at Ako's school. Head over heels, she chops off her hair and decides to become the manager of the basketball club in order to win his heart.
Will he open to her will or is her close friend Taiji more for her?

Contains the one-shots:
"She is Difficult to Deal With"
"The Love Maze"
"Celebrating Christmas With You"

What happens when your childhood friend becomes your teacher?

From Manga Abyss:

Wakaba attends the cram school where the popular Toudou-sensei works. The quiet but easily angered Wakaba is a weak person… and she suddenly confesses! Even though Wakaba thought she wasn’t being taken seriously, sensei came to console the broken-hearted Wakaba. They decide on a ‘trial date’ to see if they’re compatible, but sensei is an adult and also popular, and Wakaba is uneasy…

Contains two extra stories:

Aoi Bokura
Yayoi and Junya are a couple. She was dumped by her ex-boyfriend for whining and being too clingy. So this time she restrained her feelings towards Junya, including her jealousy of other girls.

Love You
Arisugawa Koto, the student president of an all girls high school, meets with the boys' student president to plan a mixer between the two schools. She remembers Taichi from her childhood when she confessed to him, but he calls her "ugly."

Hagiwara Yuu has been holding the secret she likes girls from everyone and then she decides to take a chance on Nomura Chihiro.

Migiwa Kazuhiro has always been watching Ren, cute, admirable, and his first love. With all his courage, he finally managed to give her a love letter and confessed on a train, only to find that Ren is...?

In response to signs of an impending invasion by alien conquerors, five young people have undergone modification surgery in order to gain the strength to fight them off when they arrive. There's been no sign of them since the initial warning message ten years ago. The hero of justice Serena and her teammate/lackey/punching bag Souya have been using their powers to protect the weak and destroy evil wherever it looms its head. But with the sudden return of their childhood friend, things are in for a change.

From Okazu:

Hayase has gone to this school for years, so she knows that you do *not* touch anyone on Monday, and if you do, there's a little incantation that must be recited. But Mashiro has just transfered in, and does not know these things. Hayase explains that we do not touch on Monday, because not too long ago two girls did - and they fell in love, became lovers and tried to die together. Therefore, if you don't recite the charm, you might fall in love with whomever touched you...and that would be bad. Of course Hayase explains this after Mashiro has touched her...on a Monday.

Despite the title this manga has nothing to do with sex, just young people rebelling against the world.
The manga is about the adventures of a girl, Kaho. In the first chapter she goes on holiday to Okinawa and starts following around Yuki, a car-stealing punk.

Yuzuki has always had an unrequited love towards her childhood friend Junya, but one day Junya starts dating his classmate Kaori.

Yuzuki was shouldering the pain that she would never be able to express her feelings to Junya. A while back, she had noticed that Toshiki was looking at Kaori with such a sorrowful expression. In order to obtain the paradise that she desired for, she decided to become accomplices with Toshiki but…!?

Contains a short story named Hatsutaiken:

Araki is dating Arashi but she has a secret from her past that she doesn't want Arashi to know. Will she be able to keep it a secret?