From: Easy Going Scans

Our protagonist Jo Cheul-Hee is a delinquent who enjoys picking fights and aims to take control of his new school where he gets transferred, but what he doesn't know is that it's an all girls school.
Being the only male student there, everyone thinks he is gay!

From Delish Scans:

Facial communication, no words necessary.

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Two children, a girl and a boy, pass each other on the way to school, everyday at the same exact place, at the same exact time. They never talk only making funny faces at each other. But one spring, something's bound to change...

Fat school delinquent meets cute, shy girl.

A girl's senpai desperately tries to convince her to let him touch her butt - even offering up his own glutes as a trade! But convincing her won't be easy!

A short romance one-shot about a boy being dumped by the girl he likes, his cousin, and a cough.

Hubby my ass! Who's your hubby,
And who are you calling Wifey?
Promise between households?
Pu! Who cares about that kind of thing!

Oh goodness, our neighbors,
Just listen to the way he's talking.
I'm telling you to keep the promise
Since it's a vow between two households!
It's not as if I've become your Wifey
Because I wanted to be!!!

Women's virtues are;
One: Carefulness of conduct, Two: Carefulness of conduct.
This is the way she was taught to act,
Genuine country maiden Kim Seon-Nyeo.
Because of resistance(?) from Cha Eun-Hyeok who is to become her Husband,
She gives up on trying to be the perfect wife,
And reveals her true nature
As a hot-blooded fighting art specialist!

Taming Jogang Jicheo(1)?
It's actually taming Jogang Jibu(2)!

(1) Wife who has shared one's hardships
(2) Husband (literal meaning father) who has shared one's hardships

Kurosaki Sou is a 16 year old who summons a devil to take his virginity. He hopes for a devil with flaming red hair, large horns, and black wings. He gets exactly what he wishes for, although he forgets something else rather important. Now he’s forced to live with this devil and has to think of a way to get rid of it, and most importantly – survive its lust.

From Tokyopop:
Young Mikan runs away to Tokyo to follow her best friend, Hotaru, who has been enrolled in an exclusive, secretive private school for geniuses. But it turns out that Alice Academy is a lot more than meets the eye. If Mikan wants to stay by Hotaru's side, she has to both pass the strange "entrance exam" and face the even greater challenge of befriending her very odd new classmates. Whether it's Hotaru's gift for inventing gadgets, the cranky Natsume's fire-casting ability, or Professor Narumi's control of human pheromones, everyone at the school has some sort of special talent. But what ability, if any, does Mikan possess? Mikan is going to have to rely on her courage and spunk if she's going to stay in school, or even stay alive!

From Nigihana: One day a high school student named Haruhiko who is aiming for Tokyo University has discovered a very important secret. From the closet, appeared a beautiful girl with a black pony tail, Utsuki who came from "Moon Village" with her Ninja Troop said to him, "It's been 7 years, master."

From Forever More:

Tired after working all day long, the divorced (with kids?!) salary man, Saeki Ryouji was taken in by the incredibly rich high school student, Mibu Ryuunosuke, after having collapsed in the middle of the street. When he awoke, he was kissed by Mibu who said, “I like you,” at which point he realized he had been brought to a glamorous and luxurious mansion…!!! Even despite this astoundingly shocking development, the guilt he felt the second he rejected Mibu, who was on the verge of tears, brought Ryouji to…? Differences in age, differences in social standing, they are nothing but a bother. Are there simply too many obstacles to the love that has blossomed between a sheltered young Master and a pure and cultured oyaji? At the same time, the sense of duty an obstinate butler feels towards a forceful senior high school student, who is in a position of superiority, brings to mind the question, “Do you like butlers?”

From Chibi Manga:

Yoshino wanted to give valentine chocolate to her boyfriend, but a robot which was created by her inventor father, tried to get in her way!?

Despite the content of their relationship, the delinquent Towa Aikawa is still a "friend" of the Student Council President, Mikado Shirahane. But today, Towa gets to sleep-in at Mikado's house for the very first time! Could their relationship advance into "lovers" now...!? List of Warui Series: Vol 1 Warui Koto Shitai [1-1] Vol 2 Waruiko Demo Ii? [1-2] Vol 3 Kirai ja nai Kedo [2-1] Vol 4 Koi Ja nai Kedo [2-2] --- Warui Koto Bakkashite Gomennasai [1-3 &/ 2-3] Vol 5 Warui Yatsu Demo Ii [1-4] Vol 6 Mujihi na Otoko [3-1] Vol 7 Warui Koibito ja Dame? [1-5] Vol 8 Kare ja nai kedo [2-4] Vol 9 Mujihi na Anata [3-2] Vol 10 Sunao ja nai Kedo [2-5]

From Shoujo Crusade: Akari always goes to a particular coffee shop, but not for their coffee. It's to see Naruse Hijiri-kun, a waiter who's totally Akari's type. And then suddenly one day she finds him waiting outside her school? Also includes: • Haru Koi Kaede has been trying to befriend her desk neighbour Muromachi Isami, but when she greeted him, he yelled at her?! In fact every time she greets him, he glares at her. Not giving up, Kaede tries to see the good (cute) side in him... • Power of Love Mikoto has always felt lonely ever since her parents divorced, but she starts living in a new family with a dad and a son in her age, Shou. As much as tries to have a happy family in her new home, Shou seems to be reluctant, but our happy-go-lucky Mikoto will not give up! • Flying Start! • Haru ni Kaze to Yuki ga Furu!

After ups and downs and lots of deep things went between, now the delinquent Towa Aikawa is a very "deeply involved friend" of the Student Council President, Mikado Shirahane. But when Towa visits Mikado's house for the very first time, Mikado's elder brother thought he was Mikado's sex-friend... List of Warui Series: Vol 1 Warui Koto Shitai [1-1] Vol 2 Warui ko Demo Ii? [1-2] Vol 3 Kirai ja nai Kedo [2-1] Vol 4 Koi Ja nai Kedo [2-2] --- Warui Koto Bakkashite Gomennasai [1-3 &/ 2-3] Vol 5 Warui Yatsu Demo Ii [1-4] Vol 6 Mujihi na Otoko [3-1] Vol 7 Warui Koibito ja Dame? [1-5] Vol 8 Kare ja nai kedo [2-4] Vol 9 Mujihi na Anata [3-2] Vol 10 Sunao ja nai Kedo [2-5]

From here:

The basic story: a high-school student (Nanase Hokuto) living away from his parents (who are in Australia) shares an apartment house with three older girls. His exposure to their whimsical and teasing nature leaves him pretty much despising females. However, the high-school idol (Taniyama Maina) ends up having a crush on him. Her best friend is Nakajima Atsumi, your typical sukeban. Hokuto's best friend, Moriyama Syuuichirou, is the young-punk biker. These two friends conspire to hook Hokuto up with Maina, much to Maina's delight and Hokuto's chagrin. Into this setting we interject the jealousy of the rest of the high school, a female rival for Hokuto's attention, a number of fights, the inevitable parents recalling Hokuto, and Maina threatening to run away from home. We could go on, but pretty much everything is in here.

Sequel of Kirai ja nai Kedo and Koi ja nai Kedo making it the third story of the Yuki-Shinonome series. As we left off from Koi ja nai Kedo Yuki has finally agreed to date Shinonome. But it seems he is having trouble thinking of Shinonome as his boyfriend. Will Shinonome once again be able to win over his lover's stubbornness and become real boyfriends with him? List of Warui Series: Vol 1 Warui Koto Shitai [1-1] Vol 2 Waruiko Demo Ii? [1-2] Vol 3 Kirai ja nai Kedo [2-1] Vol 4 Koi Ja nai Kedo [2-2] --- Warui Koto Bakkashite Gomennasai [1-3 & 2-3] Vol 5 Warui Yatsu Demo Ii [1-4] Vol 6 Mujihi na Otoko [3-1] Vol 7 Warui Koibito ja Dame? [1-5] Vol 8 Kare ja nai kedo [2-4] --- Warui ko Tachi no Bansan [1-6 & 2-5] Vol 9 Mujihi na Anata [3-2] Vol 10 Sunao ja nai Kedo [2-6] Vol 11 Mujihi na Karada [3-3] Vol 12 Warui Ouji Demo Suki [1-7]

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1-4) About The Neighbor + Extra
That day, Miyata, who is still preparing for his university exam, got home and found not his brother, but an unknown man. That man, Shirai, has just moved into the neighbourhood. He looks at Miyata's messy test sheets and offers, "Shall I teach you?" With his airy smile and nearly perfect self, Shirai forcefully becomes Miyata's private tutor... and Miyata slowly becomes interested in Shirai... From Shinmakoku Scanlations

5) Unknown Words
Imaoka is a frivolous playboy, who might not be as frivolous as they say. Miki is a quiet boy who catches Imaoka's eyes and heart.

6) Unknown Name
Follow up about Imaoka and Miki

7) The Freezing Palm
Ishida has a dark secret about something he did in high school.. but 2 years later, he runs into his old teacher Mizushima-sensei - the person he wronged. Instead of being angry, Mizushima invites Ishida into his home... ?

8) Blindfolding Your Eyes Gently
What should I call you from now on? Continuation of Ishida and Mizushima, whom he now calls Motoi-san.

8.5) Sweet Fingertips
The Freezing Palm extra.

From Cinderella Story:

Matsuri Takanose a first year high school student. Her mother is the board chairman of the school, and Matsuri is under a lot of pressure to be the perfect student. One day after a grueling meeting in her mother's office at school, Matsuri encounters two boys who treat her differently. One is Takemasa Andou-kun, a smart, quiet guy who is known for keeping to himself and not talking much. The other is Watanuki-kun. Kaguya Watanuki is a very cute, outgoing, athletic guy. He and Andou-kun are classmates, but they don't appear to be friends. Later Matsuri happens to find out about her favorite idol pop singer and those two's relationship... This sets up an interesting love triangle...

Mia is a princess of the country where people are either masochistic (M) or sadistic (S), but generally only royalty is (S). Her daily duties consist of insulting, stepping on and generally bullying her people, and they're all happy about it! But the day comes when Mia has to transfer to a foreign country for a year to study there. The only problem is.... people there are normal. When Mia changes schools the (S) and (M) hilarity begins!