From Shogakukan:
Hitomi Kosaka, who wants to be a novelist, admires Takeru Murasaki, a genius writer and high-school student. She dreams that he would help her make her debut, and enters the same high school that he attends. However, being opposite of the image, Takeru is dirty-minded and sadistic in reality. What is worse, he says to her, "I'll make love to you."

Info from Utopian Dream - collection of 1 shots:
Story 1: Strawberry Holiday (ストロベリィ▽ホリデー)
Nana Asou is 14. Her dream is to have the life of a normal girl!? Constantly super busy as an idol superstar, one day she makes her escape!! Throwing everything away, she somehow winds up with…a cake baker!?
Story 2: Candy Charm (CANDY▽チャーム)
Story 3: Secret Love Chance (ナイショのLOVEチャンス▼)
Story 4: Phone Girl (ケータイ彼女。)
Story 5: Electric Girl (ビリビリ　ガール)
Story 6: Cheers! (チアーズ!!)

Due to changing schools constantly, Hime has been unable to make any friends. Now, at a brand new school, Hime sets out to celebrate her youth and live a dream high school life.

From Summer Rain:

The story unfolds in the Edo era in the Yoshiwara red-light district of Tokyo. Akane, a girl whose family is from Samurai, is sold to a brothel to be orphaned. To be the "little sister" of the "lady" No 1 spot. This will bring a client ask, then she meets a stranger very peculiar man. What will happen after that meeting?

From MangaHelpers:
Since their mother's death, sisters Tomoe and Mikage have been mostly raising each other. The older sister, Tomoe, is determined to get good grades and work her way into a good college. However, she's disturbed by the trouble Mikage sometimes gives her. For instance, at the beginning of the manga, Mikage sneakily locks a collar around her older sister's neck, forcing her to go through the day wearing it. Mikage wants Tomoe to think only of her, and her affection may be beyond sisterly love. However, at school, Mikage has made a new female 'friend' that has a serious crush on her. The two sisters have their separate lives at their respective schools, but their life together and their relationship may be most important of all.

From Yen Press: Yun-Ook Jang is a 26-year old freelance illustrator who rents out a room to help pay off her debts. Her tenant is a 19-year old drop out named Bum-Moo Lee who only has a part-time job. Before Yun-Ook knew how old Bum-Moo was, he seemed rather mysterious and cold to her, and the two argued all the time. Then one day, Bum-Moo asks her a most dangerous question: ”Do you mind if I like you?”

From Rebellious Love:

About a school who has an elite section and a regular section. These sections are always at war; however, for the next school festival, the leaders (matsuriya) from both sides want to work together to make it a good school festival.

Teppei Arima is a second-year high school student who lost both of his parents in a traffic accident on their way home from a family trip. His grandfather, Isshin Arima, happens to wield the puppet strings in Japan’s vast economy and demands that Teppei becomes his successor as the head of the Arima Group. To prepare for his debut into high society, Teppei enrolls in an elite academy for the scions of the rich and powerful.

A Collection of early stories:

From Covenant of Darkness:

Face, body, and talent, all 3 are what conspires Misako’s love for the star of the basketball club, with a genius ability and super beautiful Urasawa-kun. However, Misako's first and last profession of love in her lifetime was drastically discarded. Strangely, Urusawa-kun decided to model nudely for an art exhibition in hopes to winning a prize because he has an eye for that thing. The lingering affection is banned and the conditions that sends Misako's heart to abide… A romantic comedy treasure?!

From Yen Press:

Welcome to the prestigious Saint Leaf School, where, among other things, the boys are so pretty they give the girls a run for their money! Amidst this bed of flowers exists one Hitomi Sakuragawa, a sweet girl with a not-so-little weight problem, who lives in a nearby apartment owned by her doting older brother. Hitomi also happens to have pretty much the best luck on the planet: Her neighbors are some of the hottest guys in school! But will she need to steel her willpower, cut out the cookies, and slim down before they’ll even give her the time of day? Or will they be charmed by her kindhearted, genuine personality? It won’t be long before Hitomi discovers that the road to a healthy lifestyle is paved with hilarity!

When Hana falls in love with a young interloper she encounters in her college class, the last thing she expects to learn is that he is part wolf. Instead of rejecting her lover upon learning his secret, she accepts him with open arms. Soon, the couple is expecting their first child, and a cozy picture of family life unfolds. But after what seems like a mere moment of bliss to Hana, the father of her children is tragically taken from her. Life as a single mother is hard in any situation, but when your children walk a fine line between man and beast, the rules of parenting all but go out the window. With no one to turn to, how will Hana survive?

From Sura's Place:
Cha Ji-Yyoung is a journalist who makes a terrible mistake and is forced to make amends for his fault. He is forced to crossdress and enter a woman's university to reveal corruptions. His interesting life as a 22-year-old female dancing student begins.

1. Mousou Cinderella
2-3. Sugar Chuudoku
4. HEY YOU!!
5. Konna Yozora ni, Tsuki
6. Mousou Ningyou Hime

From Aerandria Scans:
Arima and his little sister Chihiro are the twins of the Momoyama family. Six years ago, they've overheard their parents say "We will tell them the truth when they turn 16." The two worried that they might be adopted during those six years, but the truth they learn on their 16th birthday is even more shocking! Also includes an award-winning one-shot.

Sanada Beni is 13 years old now and she is part of a ninja family. She is finally a Red ninja after 13 years of age. She takes an oath of loyalty to fulfill all her missions as family's "red ninja" descendant. But the problem is she is still a ninja in training. Four years ago she accidentally met a boy named Kiyoshi Makoto. Now she is set off to his school to protect him. Now what will would happen as Makoto continues to protect the entrance ceremony and Beni protects him?

First Kurumatani Haruko Long series (no more a simple oneshot)!!! By Alessia-chan: Ruki is an otaku and is in love with a character of manga called Shun-sama! Suddenly she meet a guy that will live in her house due to her mother sudden travelling and that looks exactly the same as Shun-sama! But does this guy is really a prince-like such as Ruki expect?

Fujishiro-san lives by the motto "industrious, diligent, sincere, and punctual." But for some reason her eye is always drawn to the mysterious but good looking guy in her class, Kuze-kun. While he teases her, she falls in love?!


(Not to be confused with the one-shot by the same name)

From Tokyopop: Unfulfilled love always ends tragically… or does it? Through different seasons and different eras in time, two lovers cross paths again and again, trying for that one chance to get it right. Different lives, at different points in history, but one thing remains constant—their love for each other. Spanning the beginning of history, WWII-era Japan, modern-day America, and the far distant future, these love stories remind us that love truly has no boundaries.

Tachibana Ritsuka is a female second-year high school student who attends Shiko Academy in Shiko Town. She enjoys her school life while living with her mother Maria, but one day, that balance falls into ruin when she discovers several of her attractive male classmate are demons.

Takato Kei is just an ordinary college student, training for an ordinary life, when he falls onto a strange but appealing part time job. He's been hired to tutor a teenage girl at home for 10,000 yen per hour! The girl in question, Fujioka Yukari, is not a high school student, but a highly successful day trader who has already amassed 170 billion yen! Despite her money and her beautiful apartment, Kei can't help feeling that there's a certain loneliness about the cute teenage girl. She even seems embarrassed of her career, as if her obsession with the stock market and the vast amount of time she spends moving stocks makes her an otaku. Kei may be just the person she needs to help her break out of her isolated lifestyle and acquire the one thing money can't buy - happiness.

(*Although the main story as been fully scanlated, the Extras from the tankobon are still unscanlated.)