A guy named Kawai is trying to get the narcisstic Kikuhara.

From DMP:

At Wataru Fujii's high school, it's all the rage to wear paired rings with the girl you love. Wataru wears one though he is single, and one day inadvertently discovers that his ring pairs up with that of tall, handsome and smart Yuichi Kazuki, the senior classman idolized by the entire school. Though Kazuki has a reputation for being kind to all, when dealing with Wataru, he is strangely harsh. Their paired rings somehow draw them together and the two alternately clash and attract, as they must sort out their budding feelings for each other.

Gomennasai.
A student hooks up with a woman for casual sex. They have an awkward meeting sometime afterward, in his classroom... because she's a substitute teacher.

Bousou Kiss

"...Gokko"
Brother and sister. A couple plays an incestuous game where they do perverted things to each other until one gives up.

Otoshigoro

One Step

Ferris Wheel
Sudo-san has a lover, who is two years younger than her, Takahana-kun. After receiving the news that Takahana-kun is going to be transferred, she thinks about how to work out their relationship.

Yume Musubi to

Hakuchu Yamu

Yoshi x Yoshi

Only One
Izumi Taeko is a weird and flighty girl, rumor has it you'll only need a coin to get your way with her, but is this true?

- Animexis

Reset

A collection of short stories:

1. Only You
Accused of being a molester, Mochizuki gets saved by the gentlemanly Nagakura, and their friendship begins...

2. Only One
Following his divorce and subsequent loss of his apartment, Mochizuki moved in with Nagakura though they've barely been together for two weeks. A problem soon arises when Nagakura's colleague, Hayami, appears on the scene. Apparently Hayami is an ex-student of Mochizuki's. Just why has his appearance caused a sudden rift between the two lovers?

3. Yasashisa no Kyori (The Gentle Distance)
Having grown up with a pair of brothers from next door, he slowly discovers his attachment to the younger brother... Could it be love? And what is this niggling feeling he feels for the older brother?

4. Mousou Prize! (The Delusionary Prize!)
Shino has quite a crush on his cute tutor Akio. Akio promises Shino a reward if he can do well on his mock exams but what kind of reward is the student expecting? Will the tutor be forced to pay up?

5. 17-sai no Paradox (A 17-Year-Old Paradox)
Kuroe is annoyed by his always-smiling teacher, Mizushiro. "So you treat all your students equally? So annoying!" Kuroe passes his boiling point and decides to take action in this ardent and thrilling school romance.

6. Extras
Mizushiro tries to get Kuroe to say those magic words.

*Note: On most manga reading sites, the chapters have been uploaded separately. If you want to read all the chapters, you have to search for them one by one. The only missing chapter is the 3rd.*

A classic manga about girls at a private all-girls school. The storyline centers around the experiences of Nanako, a "normal" girl who is invited to join the prestigious school organization, the Sorority, and is resented by all the other students because she doesn't appear to be qualified. Other key characters are Nanako's two friends: Tomoko, her friend since childhood who is alienated by Nanako's decision to try to join the Sorority, and Mariko, a strange, obsessive girl who is invited to join the Sorority along with Nanako; her "older brother," Henmi, who she corresponds with by mail; and the "Three Magnificent Ones," all of whom are admired and quasi-worshipped by the rest of the student body: the head of the Sorority, Miya-sama, the haunted, pill-popping rebel, Saint Juste, and the star athlete with a mysterious disease who doesn't like the Sorority, Kaoru-no-kimi.

Contains an unscanlated oneshot in volume 3: Early Spring Trembling.

From Esthétique:

Sakura had lived with her grandma ever since her parents died in a car accident when she was three. When she turned fourteen, her grandma also passed away, leaving her alone. Just when she was about to give up hope having a family, out of nowhere, four guys claim to be her older half-brothers.

---

- Himitsu no Tobira no Kugurikata (Vol. 4)
Terasima Tika has always wished to meet her prince charming. When she accidentally enters the 'Spirit Door' and is placed in the body of her brother, she is forced to be him for the day and go to an all boy's school where she hopes to finally meet her prince.

A story about an Onmyouji who helps supress the evil inside a young samurai who is said to be the reincarnation of the legendary demon Shutendouji.

Onee-san no Jijou (Sister's Situation) is about a 16-year old high schooler named Tsukiko. She has a crush on a guy in her class, who is also a popular rookie soccer player named Kou. The thing is, her mom just got remarried... to Kou's father, making Tsukiko and Kou step-siblings.

From Aerandria Scans: My mama is in heaven, but...I have my big sister!! Hinako is a high school students who has a lot of things that she wants to do, but for her cute little sister, she will become a mother!

Taken from VIZ:

Kosaku Hatanaka is the first pro boxer ever produced by Mukaida's Gym. He's also the bane of his coach's existence. Although he's constantly waging war against his appetite, Kosaku never met a meal he didn't like! Naturally, this plays havoc with his weight class. Junior bantamweight, bantamweight, junior featherweight... every time he moves up a class, his coach's hopes plummet. Isn't gluttony a sin?

Sister Angela is a young novice nun who's dedicated, passionate, and convinced that we should give peace a chance. Although she refuses to acknowledge it, it's obvious that Kosaku comes to St. Mary's for more than confession! He comes to see the smile of the beautiful sister, of course! Can her faith redeem the gluttonous appetite of the tempted lamb astride the scale?

From Shinmakoku Scanlations:

One day, Shirou got a love confession from a pushy boy named Kuroda. Kuroda reminds him of his dog, from a long time ago. The younger student poked his heart in places he'd never suspected.

Story 1. Boy Next Door
Takeshi is straight until he sees Kazuya lying naked on his friend's couch. After their intimate encounter, can they find a way to make a relationship work and manage to survive on their unusual part time job?

Story 2. One Heart
A story about a part-time, student worker and his ex-salaryman boss. When his boss's company is in danger of going bankrupt, how will the part-timer convince his ex-salaryman to take a loan from him?

Story 3. Otoshimono
An odd encounter between two strangers results in tales of violence of questionable validity--and of course sex. But is this just a one night stand?

Story 4. Long Way Home
Katou has money problems, loans and he hasn’t paid his rent for 5 months now. When his realtor Yui suggest that, if Katou does a job for him, he will give him 3 more weeks to pay the rent (before kicking him out or worse), Katou happily agrees… (Yui appears also in Night Walk)

1-2) On the Quiet
On a cold winter day, when Ikewaki Kou, a college student, forgot his key and couldn't enter his apartment, he was invited into his neighbour, Shiraishi Hiroya's room. But the room was so dirty that there wasn't even space for him to put his foot down, and Kou was really shocked by this gap from his neighbour's orderly image. Even so, Kou remembers the steady palpitation of his heart as he conversed with the bashful and unaffected Shiraishi. Things got heated when Kou realised that Shiraishi might like his brother instead.

3-4) Tangerine Report
Nakatani is a nice guy... to everyone else in school. For some reason, he seems to hate Ikeuchi. What could be the reason? Ikeuchi finds himself drawn to Nakatani after seeing the sunlight turn his hair a beautiful color, along with an arousing desire to touch him.
"I always smile gently, because I'm scared of being shunned." Part two is told from Nakatani's point of view.

5-6) Unreasonable Baby
Sugimoto, from Tangerine Report, is back with his own story this time. He took his friends' gay relationship very well... but why? It turns out, he's had some experience himself... with his senpai Kotegawa.
Second part told from Kotegawa's point of view.

From Biblo Eros:

Love blossoms between a weatherman and his cameraman!

Without really understanding what was happening, Rhea was chosen to be one of the fifty "apprentice hero" of the kingdom. Despite the apparent mistake, she unwillingly accepts this new adventure, armed with her manual under her arm. Right after bidding good-bye to her best friend, she encounters 2 weirdos who will quickly become her comrades, as well as the mysterious Burn, another apprentice hero who seems really skillful.

1) Ritsujoukan Crisis - Caught in the middle! Tagosaku Yamakawa just moved to the big city to be a housekeeper at an all boys boarding school, even though he's only sixteen. However, part of his job is to control the unruly class G. This includes an Italian exchange student obsessed with figurines, a 30-year-old guy with a gun(?), Kazamatsuri, who thinks of Tagosaku as his pet gerbil, and various other scary guys. Will Tagosaku survive? 3) After 15 - Relationship between the teacher and old army guy. 4-6) Gaku Ran (shojo story).

THE ITALIAN PLAYBOY'S SECRET SON

from fictiondb:
Conveniently wed!

Cesar Villon de Falcon: the world's finest racing-car driver and Monaco's most notorious playboy. But a terrifying crash has left him fighting for his life.

Sarah Priestley: the enchanting woman at his bedside, who has a secret she hopes will help revive him--Cesar has a son!

The little boy who has his daddy's eyes gives Cesar a new lease on life. But it is his convenient marriage to Sarah that has the potential to make this courageous man whole again....

"What's going on? I just don't get it. Ever since I met Hashimoto, my heart's been filled with emotions I've never felt before..."

Since meeting Hashimoto, whose personality is the complete opposite of his, which is flippant and cold to others, high school student, Makino, can no longer hide the changes within his heart.

Let's take a good look at what happens in the shogun's bedchambers (and around them).

From Fantasyshrine:

Kenshiro and Ryoma are two different polarity types of president! Which one of them is the befitting heir to the Ichinomori Group? I, Kitayama Eita, must infiltrate their respective companies to determine just that! Even if it means I am subjected to sexual harassment, cosplay, and more. What I didn’t expect was for my treacherous body to actually respond to both of them! “Oh, you’re extremely sensitive,” Ryoma said gleefully. “I’ll train you thoroughly to my ideal type,” promised Kenshiro.