From Aerandria Scans:

Karashima is a high school boy with a beautiful voice. So beautiful that he can make anyone do anything, just by saying the words. Because of his potentially dangerous ability, he distances himself away from people but soon finds himself in the middle of various criminal investigations that he can help solve, and a girl named Kokubu who seems to be in love with him.

1) Yurusarenai Otoko

2) Aishiatteru Futari

3) Seigi no Mikata no Koi no Yukue (Love & Battle)
Seigo, who grew up in a village, moved to Tokyo to find a job and to fight crime (apparently he has some strange superpowers), since not much happens in his village. One day his childhood friend Touma visits him and challenges him to remind him of his mission. At least that's Touma's claim...

4) Kanoko's Story

Note: Chapters 1-3 are shounen ai stories while chapter 4 is shoujo.

James Block is a former sports star whose criminal endeavors landed him in jail. In prison he meets "Dr. F", a strange old man who tells James about a beam that can turn living things invisible.

After escaping from prison, James finds and uses the laser on himself. But, because the beam has not been perfected yet, it only rendered his skin invisible, leaving his insides visible to the outside. Angered at his disfigurement, James takes the name "Alabaster" and begins eliminating the hypocrites and the boastful. He is joined by Ami Ozawa, the granddaughter of "Doctor F", who was rendered invisible after the doctor used his pregnant daughter as an "F Beam" test subject.

On their trail is Rock, a vicious FBI agent.

From Viz:
What does it take to find your true inner self? Zen's memory has been wiped, and he can't remember if he's a killer or a hero. And a lot of people will do anything they can to keep it that way.

There's 2 versions, one tankoubon and one bunkoban.

The tankoubon includes:
「暁に立つライオン」 - Akatsuki ni Tatsu Lion (published in Betsucomi, 05-07/2003)
「トルコ取材記」 - Turkey Shuzaizakki (Omake, 06/2003)

The bunkoban version also have the one-shots:
「海に墜ちるツバメ」 -Umi ni Ochiru tsubame
「記憶の足音」- Kioku no Ashioto
Both also present in Umi ni Ochiru Tsubame.

Resume from ShoujoMagic:
Izumi Erina is a senior in high school. She only has one living relative - her older brother Takashi. However, Erina receives an arrest notice for Takashi one day, who is supposed to be in Turkey at the time!! In order to look for Takashi, a mysterious man Sinclair came to Japan and brought Erina along with him. What is the "Black Trap" that awaits Erina in a foreign country...?! A shocking romantic suspense work filled with waves of love and hate!!

A collection of short stories including

• Allumage
Kumiko left Japan for LA in hopes of becoming a famous actress, but so far has only managed to get jobs as a stuntwoman. Now that her brother is getting married, she's coming back to Japan to visit, but once she arrives, something goes terribly wrong...

From Shoujo Manga Maniac:

Tsubaki Kamui is the granddaughter of a prestigious antiquarian. A mysterious man named Sena Takuto asks for an appraisal on an artifact, one that he stole in order to prove that he is the grandson of the Grand Duchess Anastasia. Is this thief really descended from the house of Romanov? Will Kamui help him?

A sort of horror-mystery, Anamorphosis revolves around a group of people invited to a contest wherein they have to stay in a supposedly haunted set for 48 hours after an evil murderous spirit is summoned to produce a recreation of the murder scene.

Over half of the book features this story and the rest is a collection of bizarre shorts designed to make you go
( ﾟдﾟ)！？

From ShoujoMagic:

A collection of short horror stories from the pages of Ciao Magazine.

Story 01 - The Scream of Glass
Story 02 - I Want The Lead Role
Story 03 - Exciting Mysterious Club
Story 04 - I Want To Be With You Forever
Story 05 - Haunted Afternoon
Story 06 - My Place In The World

From Evil Flowers:

For Ran, love never goes well. She is having an affair with Tabuchi, her married boss, and once, when they quarreled, she was saved by Kazuya, a man she used to be in love with a long time ago. Kazuya used to be a close friend of Ran’s brother, but one day, he just disappeared. Ran had been drawn apart from him since then. After their reunion, Ran’s old feelings came back to life. However, there are many dark rumors surrounding Kazuya. Ran tries to find the truth, but a dark shadow is starting to settle over her life as well. What could be the reason for this…?!

26 years ago, in a third-year classroom of a middle school, there was a student named Misaki. As an honors student who was also good at sports, the charming girl was popular with her classmates. When she suddenly died, her classmates decided to carry on as if she was still alive until graduation. Then, in the spring of 1998, a boy named Kouichi Sakakibara transfers to that classroom, and he grows suspicious of the fearful atmosphere in that classroom. In particular, there is a beautiful, aloof girl named Misaki Mei who wears an eyepatch and is always alone drawing pictures.

From ADV:

While trying to bury the body of his mother deep in the woods, high school student Yuri is approached by a strange girl who offers to help him. That is... if he promises to be her "parent killing assistant." Meet Anne Freaks, a bright, attractive teenage girl normal in every way - except that she's on a mission to kill her father, the leader of the dangerous extremist cult: the Kakusei Group.

The Seijou Girls' Academy kendo club has travelled to Shoushinji for a summer training camp. Off the coast of Shoushinji is an island, Urashima, which is tied to a series of myths about oni and the "Onikiribe" who have traditionally being charged with their extermination.

A modern-day re-enactment of this folk tale begins when captain Osanai Syouko and manager Aizawa Yasumi stumble across a beautiful and mysterious young girl washed up on the beach.

Note: This is an official manga based on the PS2 game Aoi Shiro, which is a sister game to Akai Ito.

The anthology features works by mangaka from "Ward" and "Comic Zero-Sum". A new volume is released every four months. VOLUME 1: SHITSUJI (BUTLER) 1. Spider's Nest ~ Minekura Kazuya 2. Nice to Meet You, Young Lady ~ Kouga Yun 3. Holly Green and White Little Garden ~ Takayama Shinobu 4. The Situation of Goshogawa Yuzuru's Magnificant Mansion Creation ~ Miyamoto Fukusuke 5. Butler of Worry ~ Higashiyama Kazuko 6. Elevenses ~ Mikanagi Touya 7. The Incident of the Butler's Birthday Project ~ Saeki Yashirou 8. Le Droit D' Aimer ~ Haibara Yaku 9. Young Lady's Butler ~ Yoneyama Setsuko 10. The Melancholy of the Irritable Boy and Butler ~ Kikuta Yui 11. The Moon and the Visitor ~ Nanjou Tsugumi VOLUME 2: REBEL AND PHANTOM THIEF 1. CANDY ~ Haibara Yaku 2. "...That Story." ~ Masaki Haruka 3. FLIES ~ Minekura Kazuya 4. Arabiana ~ Mizuhara Kenta 5. The Ancient History of the Three Thieves ~ Takayama Shinobu 6. The Adventure of Captain Arco Iris ~ Tsutsumi Shouko 7. SKYHIGH TENSION ~ Fujimura Ayumi 8. Mushroom and Kappa: Arcana compilation for thieves on business trips ~ Magami Guriko 9. The Lonely Mountain Robber ~ Tachibana Ayun 10. LANEKEEPER ~ Fujiwara Yuu 11. Moonlight Honey ~ Shindou Arashi 12. The Unlucky Pirate ~ Asada Yasuka 13. Strobo Rider ~ Kouzuki Reo 14. Moonlight Dance ~ Kouga Yun VOLUME 3: PRINCE AND PRINCESS 1. Prince of Stars ~ Minekura Kazuya 2. Mushroom and Kappa: Arcana compilation for princes on business trips ~ Magami Guriko 3. Flower King ~ Kouga Yun 4. Rose Princess Destiny ~ Kinoshita Sakura 5. The Window of Rain ~ Takayama Shinobu 6. My Knight is a Princess ~ Kosugi Mayu 7. The Beggar Princess ~ Ueda Shinshuu 8. The Dawn Outside Heaven ~ D. Kissan 9. Princess Academy ~ Mikawa Verno 10. PRINCESESS ~ Kari Erika 11. Our Majesty's Tactful Words ~ Kisaragi Yoshinori 12. Heart-Racing Engagement Meeting ~ Saeki Yashirou 13. Listen to the Song I Sing ~ Mizutani Yuzu VOLUME 4: VAMPIRE 1. The Vampire of the Sleeping Forest ~ Kinoshita Sakura 2. Mushroom and Kappa: Arcana compilation for vampires on business trips. ~ Magami Guriko 3. To Cross the River ~ Kouga Yun 4. A Shower in the Sunshine ~ Omote Sora 5. URBAN VAMPIRE ~ Bikke 6. Sky Burial ~ Takayama Shinobu 7. Today's Dining Table ~ Saeki Yashiro 8. The Aegis of Time's Coffin ~ Yugyoji Tama 9. Forest of Nobility ~ Kayase Shiki 10. CHIYOSAMA! ~ Shindo Arashi 11. Strigoi Kingdom ~ Serikawa Mame 12. The truth of Catharsis ~ Inui Miku 13. Blood Donation Advice ~ Igarashi Ran 14. The Novice Vampire ~ Amamiya Azusa 15. Gentle Temperature ~ Kisaragi Yoshinori VOLUME 5: JAPANESE STYLE / SAMURAI 1. Last Night's Rain Lifts ~ Minekura Kazuya 12. The Queen’s Dog ~ Araishi + Oshino 13. Kakure Oni ~ Mikanagi Touya 15. Miokuribana ~ Kikuta Yui VOLUME 6: SPECIAL FORCES / TEAMS 2. Monach Sacred ~ SENO Tatsune & TAKAMIYA Aya 7. Frightening Eccentric ~ Sakamaki Yukisato 15. Twins Pocky ~ Serikawa Mame 16. Pledge of the Ox ~ Kayase Shiki VOLUME 7: WIZARDS AND MAGICIANS 2. Night bird ~ Kouzuki Reo 3. Mushroom and Kappa - Magic Users’ Chapter ~ Magami Guriko 4. good day for me ~ Omote Sora 5. Love Coloured Glasses ~ Bikke 6. The Kind Black Witch ~ Ueda Shinshuu 7. The Magician and I ~ Mikawa Verno 8. Kokonoe Kyuujutsu ~ Aoto Takane 9. Forest’s Poison ~ Kumeta Natsuo 10. The Witch and I ~ Saeki Yashiro 11. Kashoku ~ Kayase Shiki 12. Magical Girl Alice and Her Brother ~ Igarashi Ran 13. Magic! ~ Mizuhara Kenta 14.The Kind Magician and the Paper Bag Girl ~ Mizutani & Kaede 15. Secret Service ~ Suzuki Ichiko VOLUME 8: SHITSUJI 2 (BUTLER) 5. Le Droit D'Aimer ~ Haibara Yaku [SS] VOLUME 9: TRANSFORMATION / PERSONIFICATION 1. The Wolf and the 7 Baby Goats ~ Minekura Kazuya 7. Little Heart ~ Ninagawa Tomo 8. A Nameless Quality ~ Tokito Kanade 12. Super Human Console ~ Shindo Arashi 13.Private Solar System Academy ~ Sakura Maro 14. My Blue Bicycle ~ Zekkyo 15. Tique-tique ~ Mitsu Nanae 16. The Crow and the Pomegranate ~ Yoshizawa Tomoya VOLUME 10: CONFLICTS / SECRET SOCIETIES 11. A Promise ~ Seno Tatsune & Takamiya Aya VOLUME 11: TIME TRAVEL & TIME TRAVELERS 1. A Watch Seller Travels Through Time ~ Takayama Shinobu 2. The Classroom Where He Is ~ Kumeta Natsuo 11. If Time... ~ Buchi Keiko VOLUME 12: DEVILS & DEMONS (Sequel) 1. Demon’s Kiss ~ Inui Miku 6. Wednesday Swing ~ Sekka Arcana 13: Several Men and Love (Sequel) Arcana 14: Ninjas (Sequel) Arcana 15: School Uniform (Sequel)

The story centers around twin brothers, Arago and Ewan, whose parents were slaughtered by monsters. Years later, the vengeful Arago crosses paths with Ewan, who has since become a police officer, just as blood begins to flow again in the streets of London.

Tastumi is a normal boy going to school and living with his strict older brother. Orphaned at a young age, his brother has been both a mother and a father to him. One day, he and his friends are about to rescue a beautiful girl from being harrassed when she beats them up herself. When she sees Tatsumi, she suddenly calls him "Rui". What does this mean? Who is the girl? Why are there strange men attacking him all of a sudden? And why is his brother suddenly so different??

It is a little bit of old story... A family lived in a castle. They were living comfortably there. However, an accident happened. The castle wanted the girl. And, the girl was left alone in the castle. What fate does the girl face?

For years the rash tomboyish Tsubasa had communicated with her twin through letters. She had formed the idea that the gentle Arisa led a joyful school life. But upon Arisa's sudden suicide attempt, Tsubasa vows to find the reason behind her twin's actions by taking her place at school. But will this supposed joyful life be too much for Tsubasa to handle? What does it have to do with the people disappearing from Arisa's school...

From Saviour Scanlations:

Michell is a monk in the city of Maridolsi. As he goes about his daily life, he encounters many interested people as well as intriguing mysteries. Murder, rape... Michell must face the darker side of man to solve these secrets surrounding him.

From Ochibichan:

1) Atsui Hibi
When Kuniyoshi was on his way home, he saw honour student, Ikeda, in the river looking for his notebook. Then, the girl who picked up the notebook, Murozono appears and she has come to know about the ‘murder-plans’ written in it…

2) Flower's marking
Who draws the beautiful flowers on Kikuchu's desk? And why were they erased when she added one of her own next to them?

3) Cold days like before
Can the warm feelings of Tooyama thaw Ikeda senpai's heart.

4) Nameless Guest
Four people are held hostages under the threat that those who remain will be killed if anyone tries to escape. Then a professional hostage rescuer sneaks into the room looking for Tateishi Hideyo only...