From Ultimate Manga guide:

Ibuki Morisato dreamed of kissing a prince turned into reality when her dream prince appeared as the new transfer student?!

Ichika and Rio "accidentally" kissed, and he wants compensation by making her go out with him. She dislikes him and refuses, but Rio doe not take no for an answer. What will Ichika do?

From MangaHelpers:
From the perspective of an alien planet with super-advanced technology and tiny (1/60th the size of a human) inhabitants, planet Earth was the perfect location to banish their worst criminals. Five of said criminals were sent to the planet to be exiled, attached to little critters like frogs and rabbits so they can never be fully active. Due to an accident, these five criminals managed to escape and attach themselves to five different girls that were nearby. The one responsible for the banishment of these five criminals now must detach them from the girls by mouth-to-mouth release.

Yuuka has always had the hots for her classmate, Suzuki-kun, and tried to kiss him to show how she feels about him. However, when the chance came, she kissed the arrogant Makita-kun instead! She has always hated Makita, and they quarrel a lot. What will happen now that Makita thinks she liked him?!

Keita Suminoe has two older (not blood-related) twin step-sisters who love him in a lustful way and have no problems expressing it. They even like to compete about it; much to the laughter of his friends (which he usually endures without problems). One day they come to his school to give him his lunch, resulting in him getting angry due to the atmosphere. To counteract his anger, they confess their tender feelings for him in front of everyone and leave. Feeling sorry he chases after them and says that he'll study hard in order to get in the same high school as them.

By Vanderguard:

Kanon, lead singer of Die Kusse, falls for his bassists' little sister. Pretty much it's the adventures of the two and his band. If you like Visual Kei bands, you'll like this series. If you know the band PENICILLIN, the lead singer Hakuei made a PV out of this manga.

1. Kiss Yori mo Ijiwaru
Miku is admitted to enter an extremely prestigious school, where only elite students are studying, as a transfer student. Her only good point is that she's cheerful and enthusiastic. She's pleased to enter the school because it is a boarding school and the tuition is free. However, Omi, an elite but spiteful student, tells her to quit school. Miku is put in a tricky position, and accepts his challenge to a fight.

2. Sensei, Onnanoko ni Shite (Teacher, Please Turn Me into a Girl!)

3. Scandal Nante Iwasenai (Not a Scandal)
Yuuri is a total fan of the top idol Shibuki. Then during his concert, she gets an unique chance that any fan would dream of.

4. Yubisaki kara Hajimaru Furachi (The Evil Prince)
Keita, a hairstylist and a former gangster, suddenly asks Arimori Tsukasa to be his model after seeing her beautiful hair, but a street flirt comes and Keita saves her. They gradually become friends, but will there be something more?

4. Kisu, Shite Ii desu ka...?
Yue, Mako and Sana were the best of friends as children. However a love triangle between the three caused a rift in their friendship. Now they accidentally meet as adults; will things be different this time around?

-based on description from Intercross

Continuation of Kiss, Zekkou, Kiss, a shoujo manga following the relationship between Sakisaka and Hatori--the ups and downs, misunderstandings, the tears and the laughter.
A unique thing about this series is that each story/situation is told twice--once from the girl's perspective, and once from the guy's perspective! The reader ends up learning what each side was thinking.

From Aerandria Scans:

Ryuu, a super-businesslike transfer student from England--with black hair, and blue eyes just arrived! During the night of the Tanabata festival, Ryuu and Yukino became attracted to each other at first sight. He then declares, “You will be mine!” This brought confusion to Yukino, who has zero experience in love. But could she actually be falling in love?

Sayoko is a newly transferred student: gifted with rare beauty and mysterious and magnetic charm, she captures every student's attention. Among them, the introverted Yuiko and the grumpy Mari become friends with Sayoko, while Ryou, a known womanizer, wastes no time and tries to hit on her, unleashing his girlfriend's rage.

Note: Won the Shogakukan Manga Award for shōjo in 1983.

From DMP:

"The person I love is you, Haru!"
Haru is shocked by the sudden confession from his best friend Kazushi and the passionate kiss that follows! However, he can't bring himself to see the perfect and widely admired Kazushi as anything more than a friend. Determined to win Haru's admiration and love, Kazushi steals a kiss every chance he can get. How long can Haru ward off his increasingly strong and bold advances?

The rich and powerful Sagiri Kaoru is taking Rin with him because Rin's father owes a one hundred million dollars to his father. Now, he can do whatever he wants with her. Can Rin show him real 'Love'?

From: Easy Going Scans

Sul is a gardener living in the heart of a city - a veritable concrete jungle. He is an avid gardener and his yard is filled with rare plants which he tends with loving care. The townsfolk object to his practices, claiming that the plants are 'dangerous'.

One night, his garden is ravaged by a sudden, intense fire. Sul, who was blinded in the blaze, is hospitalized...and promptly lapses into a coma. While his niece anxiously awaits his revival, Sul finds himself trapped in a world full of many and varied trees; the likes of which he had never seen before. A world that, at first glance, appears to be his ideal utopia. But he soon discovers that there is unmistakeable cruelty lurking beneath the facade of beauty and tranquility...

1-2) Howl at the Moon
Miki is the bodyguard of the super-model, Ran. He's also the only person who knows that the golden-eyed Ran is in fact a werewolf. Not only does Ran have an animalistic sex-drive, he's also inhumanly strong. “Then, why does he need me as his bodyguard?” Miki wondered… And then, Ran was stabbed by a fan while protecting Miki...

3) Intoxicated by the Moon
Luke, the owner of the modeling agency where Ran works, is also a werewolf. Madoka, his assistant/secretary is always walking in on Luke seducing women in his office... but when the full moon appears, Luke is always at Madoka's house... why!? The appearance of a young new model complicates things even further...

4) LOST
Every night, Ray relives the nightmare of shooting his detective partner Steve. Unable to sleep at night, he constantly needs sleeping pills to survive. His new partner, Brad, is tortured watching Ray growing more gaunt every day. When undercover FBI agents start showing up dead, Ray's nightmares might just hold the answer to finding the culprit.

5) Secret
Alan is your typical playboy - money, women and more money. When he meets an inexperienced Japanese transfer student, Masaki, in the university cafe, he decides to try it with guys too. Masaki soon realizes that he is only a toy to Alan, and returns to Japan. Years later, Alan runs into Masaki again... but Masaki is engaged!? Blackmail is in order...

6-8) Start with a Kiss + 2 page extras (Kisu Series)
Super popular high school student Nishimura Jun has a beautiful face, a great body and women lining up to have sex with him! So why is Jun still a virgin? The romantic Jun wants nothing more that a sweet and pure love. Hiding his virginity is becoming tiring, especially since kouhai Machida seems to be onto his ruse...

Afterword

4. Kisu, Shite Ii desu ka...?
Yue, Mako and Sana were the best of friends as children. However a love triangle between the three caused a rift in their friendship. Now they accidentally meet as adults; will things be different this time around?

-based on description from Intercross

This series is a prelude to the relationship between Sakisasa and Hatori, their ups and downs. What sets this series apart is the fact that each scene is shown twice--once from the girl's point of view and then the guy's.

A collection of mahjong gekiga oneshots.

Mami was always seen as the "cool" type of girl. The type of girl that cute things doesn't suit and would be better off wearing "cool style" clothing. But Mami has a secret. She wants to wear lolita fashion!