Seikimatsu Tantei Kurabu is dedicated to the very gay and very passionate love of Sherlock Holmes and Doctor Watson. I suppose that it could even be called a doujinshi, since it's blatantly based on Conan Doyle's work, and many of his characters make appearances throughout the story. In fact, the main story is split into three sub-stories -- each one focusing on a different aspect of the Holmes/Watson relationship.

The first story is titled Paris Fin de Siècle, and is a light-hearted introduction to our protagonists. There's a little fluff, a little humor, a sardonic reunion with Arsène Lupin, and a sexually charged scene of boot-licking. (Actual boot-licking. Not the metaphorical kind!) There are also fabulous kisses, cross-dressing criminals and unusual confessions. No smut so far, though. That comes later on. Oh, yes.

The last two stories are based on actual Conan Doyle plots. The second story is based on and named after The Adventure of the Three Garridebs, and the third is similarly inspired by A Scandal in Bohemia. It's wonderful to see Conan Doyle re-interpreted through a yaoi mangaka's eyes! It's particularly rewarding to see Holmes undergo a paradigm shift after Watson is shot in The Three Garridebs; Holmes realizes that he can't take the good doctor for granted anymore, and that his old friend has become so much more than a friend to him.

From SAKURA Chitose Fan Page:
While running to her new school in the morning of her first day, Marimo has an encounter with three guys from her school, that leave her a strange pack. Later on, in her class, the three guys appear again and kidnap her! Marimo is very scared until she realizes that they want the pack again... as it happens, they are the members of one of the school clubs... a club dedicated enterely to Kero-chans and their merchandise! (These are that typical cute Japanese green frog....) Marimo enters the club and starts to fall for the leader, but this, of course, is only the start of the fun....

Ever since they met at a TV recording in a playground, Senbonmatsu has always looked up to the character Dr. Red. When he finally gets his break in the same drama, he gets to know the actual person behind Dr. Red's mask. But is Dr. Red really the hero that Senbonmatsu thinks he is...?

A collection of stories involving the cast of the hero show Dr. Five.

Oba Tamako tells of her time being at art high school.

Very short story about a secretary in love with his married boss.

The all out story of two guys, the wild and completely unpredictable Hana and the reliable, cool but somewhat naive Ikkun in a cute relationship filled with passionate love and jealousy!

Follow the story of Tatsurou Shinozaki, a priest and private investigator who works to solve strange mysteries involving mystical influence. One day a woman comes to his church looking for the mysterious red penguin. She uses a post-hypnotic suggestion on him so that when the phrase "red penguin" is mentioned, he begins to hallucinate. As the journey to uncover the red penguin begins, secrets are uncovered about Tatsurou's past, including a shadowy society that may be linked to his suddenly unreliable memory.

Guy teases girl alot while he secretly likes her (or some mess like that)

Out of sadness, a man cursed all of his reincarnations. To alter his unhappy fate, Ryou will travel through time and space, dream and reality.

Mitsu and Hiroki are close friends, and Mitsu knows Hiroki loves him. One day, the relationship between the two becomes dangerous and is about to be destroyed.

A short story about the time between spring and winter . When the spring get up , the winter will disappear ...

From Exiled Rebels Scans

Segawa Kotarou loves bonsai more than anything. He loves just reading about moss and plants so much so that the people around him tell him he sounds like a grandpa. As a side job to pay for his university fees, Kotarou is a cram school teacher during summer vacation. While at the cram school he meets Nakatsu Towa who works at a computer repair shop below the school. When Kotarou finds out that Towa also raises bonsai, he asks to be friends. However, will it just be friends, or will something more come from it?

The series appears to be a sequel to the earlier SD Gundam Musha Maruden. Official relations were formed between Earth and the land of Ark. At an inter-racial school attended by humans and Mobile Citizens, young Ryuunosuke befriends fellow student Kokuryu. Life at the school can sometimes be fierce, with student gangs seeking to disrupt the harmony. But in the face of this, Kokuryu reveals a powerful ability- although he normally looks like a little kid, he can transform into the maturer samurai warrior Kokuryu Gundam. The series initially involves his battles against similar robotic creatures along with Gundam friends such as the bishōnen Hakuou Gundam and good natured/rough and ready Sekijishi Gundam. Eventually a mysterious group emerges, forcing Kokuryu and company to leave simple schoolyard scraps behind and engage in life or death combat. The general merchandising gimmick for this series involves the Gundam's being able to combine. This is similar to the gimmick for the series Transformers: Energon

1-4) Suzuhara Jan is a new college student determined to devote himself to his studies. But a chance meeting with handsome professor Aoyama and discovery of the "Game to Win the Professor's Heart" become a distraction. Though he can't seem to stay away from Aoyama, the game may be impossible to win...

5) Takashi Namasami is wandering lost in the woods when he's found by young master Wakamiya Hideto. But the pushy youngster has a requirement for rescue: Takashi has to be his pretend lover!

The baseball club has only two members. These two guys are at their wits' end, fearing that their club will soon be disbanded. Enter a weird girl who claims to be the "No.1 High School Baseball Manager". Her goal?
To get to "The Land of Baby Cows" - or as a more sane person would put it - Koushien!

From Blissful Sin:

1-2) Scarlet
College student Akio is dating his beautiful classmate, Ryou. Unable to stand the slightest loneliness, Ryou accepts any girl who approaches him. One day, Ryou introduces Akio to a girl he is thinking of marrying which makes Akio decide to completely break it off with Ryou. Instead, a heart wrenching love story takes stage!

3-4) One Night Stand
During the day Harumi is just a normal businessman but when night comes he changes into a different person.

5) My Lover
Keito wonders why he is still in a relationship with the overly depressive Naoki

Midori is a high-school-aged lesbian who has just been rejected, driving away one of her few friends. In the world right now, there are creatures called "Extraneous" that appear out of nowhere, kill people, and disappear again. No one remembers when they started appearing, but the chance of being killed by one is about the same as the chance of dying in a car accident. Midori's mother was killed by one a year ago, and not only is her father rarely around, he's also deeply in debt. She gets attacked by an Extraneous on her way home, but is saved by a mysterious girl who claims that she's a god. Midori names her Hitsuji (sheep) because of her horns, and takes the girl in. They start a website, Hitsujiya, an Extraneous-fighting service provided by Hitsuji.

Hang Hui falls into confusion when his childhood friend, Wang Ying Juan, dies. An old man, An Dong Wei, finds Hang Hui and leads him to the River Gate. The River Gate is where the spiritual and material worlds join; the Gate of Life and Death for humans.

From TCMANGA:

Just like an ordinary girl, Momoka enjoys her boyfriend's company, eating breakfast together, dating, etc. The only difference is her boyfriend, Hiro, is an upcoming actor in the entertainment industry. Therefore their love life has to be kept in secret. But Hiro's manager wants them to break up in order to not taint Hiro's popularity...

Also includes 2 extra stories.

From Midnight Scans:

Sensei, the person whom I long for, whom I wait for, whom I love, and whom I want to be with. At night, I always think about you, Sensei. You are similar to me, but you have a completely different personality. The moment I fell in love with him, school has become a different kind of place because of him. The love between me and Sensei has begun to grow.

Includes the oneshot, Fake Letter.