From Tokyopop:

A dad that's a professional model passed on his stunning male looks to his only child, Kiri...but unfortunately, that Kiri is a girl! Tohya Enishi, the love of her life, decides to be a male model, so Kiri fakes her gender and becomes a male model alongside him. But things get really complicated when others start to fall for Kiri and her male alter ego!

Humans and demihumans live together in peace, and in this world, there's a normal human named Hironori Tabata.
One day, an angel named Suzuki Lina went out to find him and said she wants to have sex with him...the reason—? The Demon King will be resurrected in the future and Tabata's son will be the hero that will fight and defeat him.

Our ages are different, our ways of life are different, everything is different. But...I just want to be with her.
Because I've never been in a miserable, tragic romance, I can say that unrequited love is fine.
I don't know why I fell in love with this person...it's a mystery.

They have different personalities, different ages, different ways of thinking, different looks, different everything.

This is the story of girls who clumsily make up for what's lacking in the other.

These are new side stories. Not a rewrite of the original serialized twitter comic.

Natsume Shiranui is a high school sophomore who has the face of a thug. Intimidating, yet wholesome, he holds affections for Natsume Minadzuki, his beautiful and popular classmate, as he admires her because she's always been there for him, himself aiming to become, for her, every bit the hero she already is for him.

A story of two Natsumes.

Hana, who lives on Tonaki Island, a small island with a population of 600, loves reciting so much that she holds public reading sessions for the children of the island. Mizuki feels that Hana's "reading" has the power to attract people, and invites her to join the broadcasting club, of which she is the head.

"Tell me your true wish and I'll make it come true."
"I want to join the broadcasting club."

Hana decides to join the club, and has many "firsts" with the members of the broadcasting club, deepening her love of reciting...

A lazy student and a straight-laced teacher. At first glance, they seem like they are on bad terms, but things get different after classes...

Sarah is a beautiful girl who, because of her looks, is always hit on by guys that she doesn't like. One day she accidentally meets a blind guy called Elios, who flips up her skirt! But Elios is so mysterious that it makes her curious. Is Sarah falling in love? Or is there maybe something else between the two?

With its long-awaited freshman/student athletes aboard, Mizuho High's basketball team practices with a hope to play in the national tournaments. In the prefectural preliminary games, the young athletes compete with their rivals at Shonandai-Sagami, Honmoku-Higashi and Yokohama Gakuen Highs. Will Mizuho compete in the national tournaments and once again confront Narita-Chuo and Meiwadai-Hitachi Highs? And finally how will the players fare in a game against the high school basketball champion team at Tendoji? The struggles of the newly reborn Mizuho basketball team to become the national champion begin!

Won the 31st Kodansha Manga Award for shounen in 2007 (shared with Sayonara Zetsubou-Sensei).

Astronomy and geology is fun…!
Mira, who promised to “find an asteroid” with the boy she found at the campsite as a child.
She tried to join the astronomy club, but from this year the “astronomy club” and the “geology research society” merged into the “earth sciences club”!?
Let’s go search for the asteroid that we promised to look for that day.

From Mahou no Ribon:

Himeko is an energetic, cheerful tomboy who has a catch-phrase to cheer herself up ("Ike, Ike, go, go, JUMP!"). Yet she somehow lacks the courage to tell the older boy at school that she has a crush on him. Perhaps she's just not feminine enough? Magically and mysteriously, Hime-chan meets someone who is the mirror image of herself, but she's a princess! Erika, from the Magic World, has come to give Hime-chan a present that she's invented, a magical ribbon, that will allow her to turn into the image of anyone else for one hour. This ought to help solve Hime-chan's problem, shouldn't it?

A teacher is looking for a school by the name of Seishou Academy, as he is a new transfer teacher for that school. Seishou Academy is known for having students with excellent marksmanship. However, he gets lost along the way and decides to look for someone who knows where the school is at a summer festival. He encounters a girl at a shooting range and finds her marksmanship skills to be professional. The girl tells the new teacher that she is an assault rifle, not a student. Her name is FNC and is an assault rifle of Seishou Academy. The new teacher attends school the next day to find students, including FNC, practicing shooting M16s and realizes that he has come to an unbelievable school. How will his experience be at Seishou Academy?

Let's just say my best friend's... a magical girl.
The Cocktail Nights are popular, secretive battle maidens who cleanse the people of their stress. No one knows of these girl's true identity... well they shouldn't! Only I, Riku Daichi (long time unrequited), knows of one of their secret identities. But we have to keep it under wraps. Presenting a love-comedy with confidential-levels of mistakes!

High-school student Hasumi-chan is drawn to Khomura-sensei, a young, socially awkward biology teacher generally seen as weak and boring but recognized by her to be kind.

A teen disaster comedy about 3 girls who failed the grade.

After spending nearly a year as a shut-in, Koto enters first year of high school for the second time.
Together with fellow repeating students Shiki (held back due to poor health) and Tomoe (held back due to excessive free-spiritedness), as well as the expectation-immune, habitually late grade retention reserve army cadet Kaede, her experience of school life is rather different from the norm, but delightful in its own way.

Ako Kobayashi is a high school girl eagerly awaiting her prince charming to sweep her off her feet, but she has to overcome one small problem: she is so afraid of guys that she breaks out in hives whenever she comes near one. She even rejects the popular Kei Kitaooji who is the first guy to ever ask her out. However, after Kei learns of Ako's condition, he comes to school the next day dressed as a girl and asks her out again.

Super serious and uptight high school student Koutaro Suzuki and his obnoxious gyaru kouhai Sorako Mozu get along like cats and dogs. She spends her days tormenting him, while he spends his days getting outraged by her. However, the two of them share a secret...that they're living together as fiancés!! Under the condition that Koutaro marry Sorako, who comes from a wealthy real estate family, they've agreed to buy his father's company and save it from going under!!

Having to deal with Sorako, who uses this and that (and you know what) to torment him, can Koutaro make her yield and successfully marry her?!

Haruma Kiki always dreamed of doing ballroom dance as the feminine "follower" role, but as she aged she only grew taller and taller, eventually causing her to give up ever looking good in a dress or anything ladylike. Now, as a second year in high school, she specializes in the masculine "leader" role—until one day, her partner suddenly leaves her. When Toribami Michiru, a short and pretty first year, shows up wanting to join the ballroom dance club, Kiki asks her to be her new partner, but Michiru reveals that she only plays the leader role—and she wants none other than Kiki as her partner.

Suddenly living together with the most easily flustered man!? A gap love, a difference in age and generation!

Gaku, the somewhat nostalgic young delinquent, showed up in front of Akira, a high school teacher around thirty years old. Moreover, why are they suddenly living together!? This is the heart-throbbing, awkward love between Gaku, a cute, earnest, slightly foolish boy who likes to look good, and Akira, an older woman who unconsciously leads him around the nose!

From MangaHelpers:
Nogawa Izumi is a good student, and a class representative, but she has an increasingly high libido. It's gotten to the point that she'll claim to feel bad during class, so she can run to the nurse's office and masturbate. When she learns that the Earth is being invaded by aliens that look like people dressed up as animals, it turns out her high sex drive may be able to help protect the Earth. The first time Izumi is attacked by the aliens, she is rescued by Usayama, a bunny alien whose race was their previous victim. Usayama gives her a swimsuit that will allow her to fight the aliens, but which also sends her constant arousal through the roof. The scientific organization that Usayama is affiliated with think that Izumi, with her high erotic level, may be the person they've been looking for to fight the aliens. Will Izumi be able to save the Earth?

When Momoka's mother and Touri's father married, the two kids became sister and brother overnight, but as they grew up together, this relationship began to change...