From AnimeCouncil² : Gurren Lagann... School version, more ecchi and stuff, that's about it :D

From Bliss: While buying food at the supermarket, Sunao Morihara gets kidnapped by a strange man, Kuon Tachibana, who turns out to be incredibly rich! His motive? He wants Sunao to be his friend. However, before Sunao realizes, being Kuon's "friend" actually means becoming his wife!

Based on a popular light novel. from Baka-Updates Manga: The protagonist is a guy who is among the stupidest of the stupidest in the school. In this school, your grades can, under the supervision of teachers, take a virtual form to do combat! However, if you leave an examination half way, you get zero marks. A bright and cute girl, Mizuki Himeji, was having a high fever during the examination. Despite her potential to be the second highest scorer in the level, she obtained zero marks for having left due to her illness and is thus allocated to the worst class, class F. Grades mean almost everything. For Class A, they have a smart-looking teacher, a plasma TV as big as the entire wall as their blackboard, personal laptops, personal air-cons, refrigerators, adjustable seats and all kinds of different appliances. Within the refrigerator, there are all kinds of drinks and snacks. Their ceiling is made of glass, the wall lets them put up high-class drawings and plants. As for Class F, the worst class... They have Japanese desks and seat paddings. Their blackboard is dirty and there is no chalk even! Someone complains that the legs of his desk are broken, so the teacher asks, "Didn't we distribute some glue to stick wood together? Glue it back yourself later." Another one complains that wind is blowing in from the broken window. The teacher says, "I got it. I will apply for plastic bags and invisible glue to fix it later." There are spider webs everywhere, not a patch of the wall is clean. A unique moldy smell spreads across the entire room; it must be from the old tatamis used to tile the floor. This is the status of class F. The protagonist feels displeased at such an arrangement, and seeks help from his friends to try to make a change through summoning war!! And they devise all kinds of plans to try to beat the famous class A, intending to get class A's classroom and equipment if they win!!

After Mitsuhashi’s family moves into a new neighborhood, he decides to use the opportunity to become a delinquent. Upon meeting Itou he finds out that he wasn’t the only one who had this idea. Making friends and foes along the way will these two take over their school or just end up as wannabes? wo boys, Mitsuhashi Takashi and Itou Shinji, meet each other at a salon. It turns out both boys are transferring to a new school and decide to take the opportunity to reinvent themselves. No longer will they be run of the mill high school students, they will become the biggest delinquents Japan has ever seen!

1. Mysterious Person Ruka is a high-school girl who holds affections for her teacher, Tokio. But one day, a mysterious person shows up and claims that he has come from the past! Not to mention, he calls himself by the same name as her beloved teacher, Tokio. What’s more unbelievable is that both “Tokio” have the exact same scar engraved on their palm… 2. A Small Love Story Hashi is one of the two sole members of her school's literature club. The other one is the romance-novel-loving club president Madoka. By chance, he finds out that her deceased grandmother happens to be one of his favourite authors. When he asks her to provide him with some original material, it sparks a change in her disinterest in love stories and their relationship. 3. Cloe the Devil Chroe is a loner because she has a reputation of bad things happening around her, especially to people who piss her off. What her classmates don't know is that she's a demon who causes misfortune on whomever she beholds. One day, while being confronted by a group of girls, Kikuchi defends her, causing her to look at him in surprise, which in turn causes him bad luck. Chroe starts avoiding him, scared of accidentally causing him harm, but Kikuchi is relentless in his pursuit. Chroe finds herself being drawn to him, but how is a relationship possible when she can't even throw him a glance without something bad happening to him? 4. Alice in Wonderland Ruu's mother just committed suicide and everyone can't stop gossiping about it, except for her new boyfriend, Mitsu, who acts like everything is normal. With everything going on, Ruu wants to seek comfort from Mitsu, but since her mother's passing, he hasn't touched her. Does Mitsu want her to disappear, too? 5. Sugar-Coat Ako is a seventeen-year old who is in love with her cousin (who also happens to teach at her school), Shou. Shou is getting married in a month and Ako is acting out to get his attention, and to prove to herself, and to him, that he cares about her. Shou is getting increasingly worried by Ako's erratic behavior, which only started somewhat recently. Can Ako get over her feelings? Or will she lose herself in a path of self-destruction? 6. The Star and The Heart Mini and Mani are identical twins who are best friends, and do everything, and go everywhere together. To help people tell them apart, Mani wears star earrings and Mini wears heart earrings. Life is great, until Mini suddenly acts loopy and distracted. Mani discovers that Mini and Suga have fallen for each other, and Mani is jealous that despite being identical, someone likes Mini, and no one likes her. On another level, she also feels that Suga is taking her best friend away from her. To what lengths will she go to to keep her sister close?

1) Timid Fingers Hashibami recently lost his older brother, Isao to a tragic traffic accident. Though he pretends he doesn't care, deep down he is greatly hurt by it. He meets Ashino, a charming student who goes to the same school as he does. He later finds out that Ashino is connected to his brother Isao. What is his connection to Isao? Why is it bothering Hashibami so much? 2) Pure 3) Living in the Water

Kurose Urumi, an antisocial woman, just became a new teacher. On the first day of her job, she arrives in an empty classroom with a single laptop. Suddenly, a girl materializes out of the laptop, claiming to be her student, and explaining her job as a teacher is to “download the other students and help them graduate!” Kurose reluctantly agrees to the task, and slowly finds out that her job may be fun after all.

Ecchi shonen series about a school run by the ruthless "head girl's club" and a new transfer student determined to rebel against them.

From today, Meguru Kinosaki is a freshman in highschool. But it's not only that she hasn't had a first love yet; she's in fact a clean girl who's never been in touch with any guy apart from her older brother Toshiya. With this pure Meguru, her classmate Yuuma falls in love at first sight. He starts a determined attack, but the over-protective big brother blocks his way! Now Meguru's days start to turn around between a big brother with a sister complex and a pushy boy...!?

This is the tale of how Adachi Mitsuru went from being an assistant artist on a weekly manga to the superstar manga-ka we know him to be today. But it’s told (and written by) Mitsuru’s older brother Tsutomu, who was also an assistant artist early on in their careers…

Yuuki is a university student bored with his ordinary life. One day after returning home after class, he finds a strange chocolate tin in his bag. Inside it is a letter with "I want a friend" written on it by an unknown sender. When he writes a reply as a joke, the next morning another letter is inside it... Also included is Haru, Hinata no Koi and Koiiro Milky Way.

From Mangabox: Miyuki Nimi (15) has suffered the biggest embarrassment of her life! Now she’s moved as far away as she can get - to the rural prefecture of Shimane. But the wheel of destiny begins to turn as she meets the beautiful basketball player Shou Sakomizu! Watch as an average daydreaming girl challenges herself and the world! Laugh and cry with her in this Mangabox-original sports drama!

From Impossibility: Futami is an average girl in her school who isn't too special in any way. Even though this is so, she attracts very dynamic and popular people to her side. Friends with the two most popular girls at school, Futami thinks it's weird that they enjoy hanging around her so much. She thinks it's even wierder when the class prince starts to take notice of her too.

From Dragon Voice: A rather humorous and light-hearted look at high school life as we follow the protagonist, Saejima Midori. Interesting manga with likable characters. Highly recommended!

Kaoru thought that high school was boring. And then he met Kaname and Yuta. Kaname and Yuta are trying to start "The Creator's Club", a club with creation of all sorts of unusual inventions as its aim. The club's formation is opposed by Kaoru's reticence to make up numbers, and the school council president's obstinate nature. With the aid of hard work, cheeriness and sheep, Kaname, Yuta and a somewhat bemused Kaoru set about changing her mind.

Shizuka, a genius inventor ( known as walking national treasure ) fell in love with Hajime, the Prime minister's son when she was awarded at the Prime Minister's house. Shizuka still pursuits and tries to invent something to make Hajime fall in love with her. But then when she invented a love potion she accidentally drank it and fell in love with some other guy....of course this made Hajime mad because the reason why Shizuka's experiment is not working at Hajime is because...He's already in-love with her. From Manga Abyss: Super genius inventor Shizuka, a.k.a. the walking National Treasure, fell in love at first sight with Hajime-kun when she was 10 years old. She hasn't stopped pursuing him for 6 years! Every day, she worked hard to invent something that will get Hajime-kun to fall in love with her. Will she ever be able to win Hajime-kun's heart?

Fateful Encounters My name is Akari Mochizuki. I am a ninth grader, and in love with Wataru-kun, a member of the soccer club. He is very popular among girls, though he is quiet and even blunt. One day the ball he kicked hit me, and I've got a special power to be able to understand how a boy who kisses me feels.

Tenshin Ranman is a manga adapted from the Yuzu-Soft visual novel of the same name. The story revolves around Chitose Haruki, a high-school student who has had immense misfortune ever since his childhood. He lives with his grandfather and his little sister, Sana, who constantly worries about his well-being more than he himself does. Due to Haruki’s bad luck, Yamabuki Aoi, his childhood friend, often gives him charms of various kinds. Haruki lives a normal (and unfortunate) life, until one day Sana finds a mysterious package delivered to their house. The package contains a deity named Unohana no Sakuya Hime, who claims that Haruki’s bad luck is a form of divine punishment his bloodline inherited. She promises to shield Haruki from it, and starts living with him.

A girl kisses the girl she likes.

Loyal Kiss: Student Quibenyi (aka “Master Qui) has two things people like to talk about: his “light hair” and his “poison tongue”. Anyway, girls at school fall for him and his friend, Shegu, all the time. Our female main character, Xindu, plans on confessing Shegu, the guy she likes. But something goes wrong…

Mu Qian Ran, a sixteen year old girl, who had always set her heart onto studying the art of Chinese medicine, is excited as she has been accepted into her first choice of college, Yan Huang Advance technical school! At the same time, due to a mysterious portrait of a girl that no one could tell when was it drawn, Qian Ran is able to see illusions of fire. She ignores the incident, but this would start the unraveling of a great secret.

Updating

Super handsome and charismatic Naruse Fuuta, who harbors feelings for honor student, Akiyoshi Tooru, advances to the same university. However, due to their different majors, they begin seeing less of each other. What happens when Akiyoshi becomes acquainted with Naruse’s old friend, Hiyama Chiaki, and goes along to his mixer party? Sequel to Kawaii Akuma

The 5th oneshot from Yuri Tengoku Anthology. In The Glade in the Forest Behind the School, two girls share a secret place, and become close because of it.