From MangaHelpers:
After a terrible earthquake, Satoru wakes up in a pitch black cave that him and his friends were exploring. Desperately moving through the crumbling cave with just his backpack, he expects a warm rescue once he gets out. But what awaits Satoru was an unbelievable fact: Japan has sunk underwater due to the earthquake and he is stranded on an island with no one to help him. Can Satoru learn how to survive by himself?

When a genius manhua artist enters the world created byhis own pen, where humans and fantastical creaturescoexist, he is determined to become the god reigning overthis world. However, things are not as simple as he thinks.Will he become the god of this world, or will he only barelyscrape by to survive?

Summary refers to the Ohzora Shuppan re-print, 2007:

1. Lovers and Souls
Shinomiya is a beautiful college art student who lacks the morals common to most people. After agreeing to be a nude model for Matsuoka, a photography student, he also agrees to sleep with him for money even though he is straight. However, what started as a small taste of the forbidden soon spirals out of control when Shinomiya begins selling his body to other guys as a prostitute in a male brothel. Can Matsuoka save Shinomiya from himself?

2. Vanity
After the events of Lovers and Souls, Tooru is still deeply heartbroken. Trying to find solace in Hikaru, Tooru challenges the terms of their friendship. But can he handle the consequences?

3. Sleeping Beauty
Matsuoka sees Tooru for the first time.

4. A Moon in Name Only
In their last year of high school, Akihiko Nozaki admits to his best friend Kai that he's gay. Kai is stunned but it doesn't change their friendship, but Kai's curiosity is aroused and he begins to see Nozaki differently.

5. The Name of that Sky
Sequel to "A Moon in Name Only", told more from Nozaki's point of view. Nozaki isn't sure whether to trust that his relationship with Kai will last, since he's even been dumped by gay men before. What's to keep a guy who wasn't even gay from breaking up with him?

Part of Rules / Hydra Series

From Storm in Heaven: Koizumi Kanna is infatuated with the man who came to the restaurant she works at and ordered a burger with no onions. Little does she know, Toujou Ren is interested in her as well, but for a different reason. Kanna just so happens to be the mirror image of a woman he knew a very long time ago. It is for that reason that he saves her when she nearly dies in a car accident. But the life he gives Kanna is far different from the one she lived before, and she's not certain it's the kind she wants...

From Valkyrie Scanlations:

The princess of the kingdom of Dipan, Alicia, was abandoned by her parents when she was still a child. The rumour says that she was posessed by a Demon and therefore lost her life. But the truth reveals different. Alicia in truth, inherits the soul of the Battle Maiden Silmeria, one of the three Valkyries, what she has to hide from the rest of the world. That of course gives people reason to think she has a split personality. She is taken to a castle far away from her kingdom and hidden from the public and ever since living a quiet life. Until that one day when Odin, the lord of the gods, decides to come after the lost Valkyrie and forces her to return to Valhalla...

1-4) Beautiful, Beautiful, Beautiful
After the break-up with his girlfriend, Kou is left very upset, which is when he meets Akio, Mai's brother. The two of them don't exactly hit it off, but there's a strange kind of attraction that keeps drawing them together.

5) White Fingered Demon
Junior is the son of an Irish mob boss in 1930's America. His father's lieutenant, Leonard Lang is like an older brother to him, but as Junior gets older his feelings for Leo are beginning to change.

Two kids become friends, even though he has an incurable illness. One winter, he was told he wouldn't be able to live to the next spring and she...

Collection of oneshots:

1) Saigo ni, Kimi Dake wo
Hero has been inseparably bound up with his selfish friend from his childhood. He is called and comforts him whenever his friend parts from his lovers. His friend confesses his love to hero only after they fall over the cliff and is going to die...

2) Love Letter
An urban delinquent student is transferred to a local school by his parents' order. There he is stalked by a rude but pure local student...

3) My Most Beloved One Is Still You
A supervisor and his subordinate love each other. Returning from business tour of 3 months, the beautiful subordinate has become fat...

4) Koi no Sokubaku
A new recruit keeps working overtime with his wish to be admired by his supervisor. But his colleague puts the blame on him. The supervisor gets him mixed up with an industrial spy and tortures him...

5) Late Night Rain
Many people have tried to persuade a surgeon of genius to reactivate in vain. The surgeon keeps living in seclusion because he failed the operation of his lover's brain cancer and has a lapse of confidence. One boy starts working as his live-in housekeeper but the boy is his ex-patient of the surgeon and doesn't have much time...

6) A Liar
A boy loves his pet, an android. But the android returns sweet nothings to the boy because the android has no feeling. A fire occurs. The android takes his life upon saving the boy. Decrypting the microchip of the android in the cold ashes, plenty words of love are displayed on the full screen...

Kominato Riku is a high-school student who aims to be a game designer. The girl next door is his childhood friend, Haju, who is in love with him, but he has fallen head over heels for the school idol Riko. And lastly, there is the transfer student, Nodoka. With that all said you’d think this is the start of some love-comedy harem, but a rumor spreads that Nodoka's received a message that says, “you will die soon”. Riku and the gang’s fate will change in a major way. Who will live, and who will love?

Violet is a girl whose mom pays no attention to her, or her father. What Violet wants more than anything else is a pretty dress and cookies that the other moms make. Then, one day, she meets a lady at the park who gives her what she desires...

A Violence Jack one-shot from 2001. What happens when Jack and some bikers mysteriously get sent back into the age of samurai.

A young girl who's spent her whole life running away from challenges gets a second chance in the form of a "gift from God."

The fourth entry in the infamous God Series web manga.

From Viz:
Kamui Shiro is a young man who was born with the power to decide the fate of the Earth itself--a destiny he can barely bring himself to believe. But as other players in the prophecy begin to gather around him--the "Seven Seals," with the power to protect the Earth, and the "Seven Harbingers," who are fated to destroy it--he has no choice but to come to terms with his fate.

Note: Re-released under the title X/1999.

[From Tokyopop]:

Kaito Yagami is a florist/gardener by day and a hired assassin by night. He kills using poisons from plants to make money to care for his brother who is confined in a hospital.

From Viz:
Humans thought the wolves died off two centuries ago in this bleak post-apocalyptic wasteland. But some survivors lurk among the humans by mentally cloaking their animal bodies. One white wolf, Kiba, scours the land for the scent of the Lunar Flower that will lead them all to Paradise...But will it lead them to a deadly false legend?

Ms. Aoshika is not only divorced, but an underappreciated teacher at her job. But one drunken mishap leads her to witness firsthand the brutal assault and murder of a young man. However, after fainting, she awakens to discover that all of the assailants have been seriously wounded. And to her further surprise, the next day she discovers that not only is the young man, Akira, she met the night before alive, but he is now her new transfer student. This series is based off of a combination of the Wolf Guy manga and novel with aspects from "Adult Wolf Guy "Wolf Guy - Ookami no Monshou" is a modern adaptation of "Wolf Guy (SAKAGUCHI Hisashi)" with a more violent and mature setting.

A cute and sad story about two childhood friends, a promise and fireworks.

From Stage Storm:

Venice, 17th century. Safinia lives a simple and happy life with her father, a renowned artisan and his apprentice Angelo. Everything changes when a man named Ricardo Carrá comes looking for her saying the rich Poliziano family wants her as the lady's companion who has "a weak constitution". However there's more to it than it seems and after her refusal, her father is mysteriously accused of robbery...

From Lezhin Jaeha, an intelligent and great looking man, stumbles upon a never before seen beauty named Dami while working part-time as a nude model. As his obsession towards Dami increases, Jaeha's seemingly unblemished stature starts to crumble and the darkness within him begins to manifest. Original Webtoon http://www.lezhin.com/ko/comic/bnf 

1-2. Sono Tokimeki ni wa Wake ga Aru
The salaryman left his bedding to sun before work. A sudden change in weather left his bedding completely drenched. Consigned to a night of shivering, but his friendly neighbour offers his warm bed for the night.

3. Yashiro no Naka (In the Temple)
Yoshimoto is on a trip stuck with Matsuda as his traveling companion. Considering it's Matsuda's fault Yoshimoto got dumped, things could be better. But life with Matsuda is always interesting especially when the fox spirits show up...

4. Fushigi Amedama (Wonder Candy)
Yoshimoto hates how Matsuda always tells him that he loves him, so much so that it cause a bit of a problem when they're working together for a professor packing up a lot of his strange, occult-related items. Because Yoshimoto runs off, but Matsuda stays to finish the job, the professor gives Matsuda a piece of strange candy saying that, with it, he can command one person to do one thing. Yoshimoto is scared. What command will Matsuda make?

5. Arowana
Aquarium keeper has been feeling blue since his favourite fish died. One day a youth started visiting the aquarium and the keeper can't get his eyes off him. He is puzzled, what could be the reason?

6. Natsu to Nostalgia (Summer and Nostalgia)
The artist finally gets somewhere with his work and feels confidant enough to visit his mentor.