The 1998 official Xenogears 4koma manga.

Volume 1:
Seto Atsushi, the student council president, is tired of spending his days in the student council where there’s nothing but boys, and decides to recruit new members, but on one condition: they must be girls! Then Ozawa Kanae, a former delinquent, shows up in the screening for the secretary position carrying a bamboo sword…?! This is a collection of five related oneshots with a specially drawn short extra, "Classified!! Student Council Report!!"

Content:
Ch.1 Seishun Trickers
Ch.2 Seishun Trickers ~Newspaper Club's Komatsu-san~
Ch.3 Clear Sky
Ch.4 Brandnew Days
Extra 4.5 Classified!! Student Council Report!!
—Freewheeling Scanlations

Volume 2:
Komatsu Akina is a passionate photographer for her school’s newspaper club. When Aoi-kun of the Student Council confesses to her, all of a sudden she has this huge decision to make. Since she has never dated before, Komatsu is confused as to whether or not she should date the extremely popular Aoi-kun, who is constantly surrounded by pretty girls.
—Dazzling Scans

Spin-off:
Sakashita-senpai no Koigokoro

A collection of oneshots.

1) Hen Ai: A oneshot that describes the "strange love" the two main characters share. Rather humorous, as it often brings up that one is rather adamant about wanting to roleplay and the other "grudgingly" goes along with it.

2) Tomari Ki (Torch): A man is stabbed and left for dead in an alley, but he is saved by a young man who has a halo and wings who calls for an ambulance. Later, the boy appears at the man's front door and claims to be an angel with broken wings, and states that the only way for them to heal is to make people happy.

3) Messiah no Yakubi (Messiah's Bad Day): A man known as the Messiah whose tongue technique is said to heal impotence takes up a job to heal a nervous-looking man, but is quite surprised by the turnout.

4) Ore no Doukyuusei ga Binkan Sugite Yabai!: A pair of high schoolers decide to experiment by giving each other blowjobs. One wants to escalate to something more, but the other isn't sure...

5) Ore no Doukyuusei ga Kagen wo Shiranakute Tsurai: Continuation of the previous story. It escalates.

6) Kyoushitsu no Yugami: A oneshot regarding the "relationship" between a teacher and his lonely, introverted student. (sequel to Yugami Hajime from the manga Yajirushi)

Ryosuke returns back to his birthplace to help run his family's vineyard after his father gets hospitalized. He has sour memories of his hometown after being shut down by the girl next door, who he admired from day one. That's the whole reason why he's never returned after moving to Tokyo, to attend College, 3 years ago. Despite his reluctant return, Ryosuke happens to be quite popular with the ladies. His sexual endeavors start off with a fling with a former high school classmate, a charming girl working at his parent's vineyard, and a sexy nurse. He even manages to allure the girl next door who he has been dreaming of his whole life but...

A collection of stories:

1. Rakuen no Jouken (The Conditions for Paradise)
Two adult women figuring out the boundaries in their relationship--is too much freedom a bad thing?

2. Hoshi no Mukougawa (Beyond the Stars)
Chapter 1 prequel. It's about how Sarina and Sumi first became more than friends.

3. Bathed in Sunlight Filtering Through the Trees
A continuation of Sarina and Sumi's relationship.

4. 20 Musume x 30 Otome
About an art prep school teacher who feels like she can't compare to her new 20-year-old girlfriend.

5. The Opposite of "Seme" Is "Protector"
Chapter 4 sequel. Keiko wants to take things further. There are two more stories in this series in the Lapis Lazuli Dream collection.

6. We're Aiming for Love Now
It's about two women who love each other just as they are.

7. Momo no Aji (Peach Taste)
A girl struggles to convince the object of her affections to take her seriously.

8. Sakurahime Hanafubuki
Set in Japan's past. A knight protects her princess.

From Garo 1982-07.

Fergus is an apprentice fashion designer who hates his life. His master is a drunk, the love of his life is a street whore, and the only model willing to buy his clothes is a fat drug popper. While attending to his "model" at a game of War-King, a competition of beauty and fighting prowess, Fergus is treated to the sight of a real fashion model who easily dispenses of Fergus' model. Fergus then sinks into deeper despair now knowing the huge gap that lies between him and the top brands. To make matters worse, his master collapses and is hospitalized that same day. Just when he wonders if life can get any worse, fate conveniently presents to him a long-lost twin sister, Jennifer.

From Shinnen:

Ch. 1-3: Setsuna Yuki:
Nagisa is a normal high school student. For winter vacation, it's decided that they will go snowboarding. On the ski slopes, she watches a guy who is really good at the sport. She tries it out, but gets herself into a little accident, causing her to return to the lodge. There, she meets Soushi, the guy from before. It's her chance! Will she somehow be able to ask Soushi to teach her?

Ch. 4: Gokujou Ouji-sama

Ch. 5: Bitter Boy Café

Fun story about an arrogant, strong-chinned prince type and the shy, quiet object of his affections.

Part of Shounen Jump's celebration of Toriko's seven-year anniversary.

A gag one-shot about the lives of the bizarre race of gods, the Gods of Laughter.

An aspiring idol who is doing part-time work at the talent agency Fantasista, Kanade. One day, all the staff and talents (aside from Kanade and his company president Hayato) had left due to downsizing! In order to save the agency, at the request of the company president Kanade became an idol...How will his life change? It's a boy's coming-of-age story that started when he was young.

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From MangaHelpers

Kazura has her first high school boyfriend, a cute guy named Iwasaki who likes her very much. When he takes her to see her favorite band perform live, she meets the band's cool, attractive vocalist. The next day at school, she discovers a secret: the sexy vocalist is none other than her teacher, who seems totally uncool in his daytime appearance! What will she do about her boyfriend, her teacher's secret, and her growing attraction to him? [tethysdust]

The plot focuses on the Marquise de Merteuil and the Vicomte de Valmont, rivals who use sex as a weapon of humiliation and degradation, all the while enjoying their cruel games. Their targets are the virtuous Madame de Tourvel and Cécile de Volanges, a young girl who has fallen in love with her music tutor, the Chevalier Danceny. In order to gain their trust, Merteuil and Valmont pretend to help the secret lovers so they can use them later in their own treacherous schemes.

Note: The manga is an adaptation of "Les Liaisons dangereuses" by Pierre Choderlos de Laclos.

Igarashi sensei (Candy Candy, Lady Georgie, Akage no An) delights us now with this wonderful tale.

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A collection of stories.

From Hoshikuzuu Scans and Starry Sky Scans:

1-3. Overtake
Fumiya and Kengo are childhood friends with a nine-year age gap. Honor student Kengo is always trailing after Fumiya. Even after he’s become an adult, to Fumiya, he is still like a precious little brother. But ever since he became an exam student, Kengo’s been giving Fumiya more heated stares. In addition to that, he declared, “If I pass my tests, I get a kiss from you”!? Other stories include another two stories about hidden love.

4-5. Kumo no Ami

6. Mimic (Imitator)
Satomi is your average older-uke salaryman, a hard worker guy type. When one of his co-worker, Oikawa approaches him, he finds a resemblance between Oikawa and his son -who turned out in the same age as Oikawa. Later when Oikawa invited himself to infiltrate Satomi's house he makes a shocking confession enough to make Satomi falls for him.

Extra: Over Take Bangai Hen - Futari Kata o Narabete

From Chibi Manga:

Too far, it's hard to be seen. Too close, it's also hard to be seen. It hurts and makes you feel like crying. Too sad, until it makes you laugh. That's right, this is what you call first love…the most popular guy in school falls in love for the first time in his life!