Fudou Jun is a highschool teacher and takes a trip with a group of students. While there, a group of martial artists staying nearby take a strange interest in the girls.
These men are actually demons and after changing into their true form break into the cabin to rape the girls. One gets Jun and violates her.
She feels her soul being torn apart and transforms into Devilman Lady. With newfound powers and strength she kills all the demons and protects the girls from any further harm.
What are these demons and why did she turn into a hybrid of one? What does this mean for her and for the rest of humanity?

Gambling. Mahjong. Death. These are the themes of this fast-paced, undercover-agent-style manga where outrageous life-or-death gambles are made daily occurences and insurmountable odds are overcome. The most hardcore, action-packed mahjong manga you will ever see.

Included in the manga is a oneshot called Nana-chan Scrambles.

DeroDero is the story of a juvenile delinquent, Hino Mimio, who happens to also be a psychic. His ability to communicate with the spiritual world as well as his demeanors caused him to constantly interact with supernatural beings -- usually ending up with Mimio beating the crap out of the monster or spirit.

*manga is based on a true story and the true story was done in 2ch*

It's about an Otaku guy who fell in love with this beautiful lady and tries his best to get that girl with a lot of help from 2channelers (people who goes/posts on 2ch).

This story has become very famous in Japan and I believe they now have novels, several series of Manga (both Shoujo and Shounen), movie, drama, play, etc, etc.

A collection of short, bittersweet love stories, including several incestuous ones:

1) Until the Ice Melts and Turns to Blood.
The Karaoke staff call her "the lonely girl." She rents a room all night and won't go home. Why? And what can Nogami say to help her?

2) Suicide Note.
Two charming girls, Michi and Rina, decide to end their lives this day. As the day ends we slowly discover why: both the horror--and the hope.

3) White.
It happened once, years ago... Now it's all Minako can think about. She yearns to do it again. But how does her brother feel...?

4) Yellow.
She just wants her brother to look at her--really look at her as a girl, not just a sister.

5) Blue.
They were finally reunited after their parents divorced. She can't resist her feelings for him anymore. But will she lose everything for one night of bliss?

6) Prohibition.
A walk together. A stolen kiss. Tears.

7) Moon River.
A young man studies and studies while being afraid of his own problems of failing. Until he meets a girl with a specific problem of her own by the river...

8) Bitter Cakes.
Miho meets with her friend Natsuki, who is blind. Natsuki trusts her other senses--and herself. But Miho trusts no one--yet perhaps trusts her eyes a little too much...

9) Love Horizon.
A girl sees her high school crush by chance, but something is very different about him.

10) The Day It Rained.
A short political piece regarding a young man, and a doll.

11) No Count.
A young girl finds out that her first kiss was with her oniichan.

Makoto Niwa moves to live in the city and meets his first cousin Erio Touwa at the house of his aunt Meme Touwa. Erio is no longer enrolled on the register of the school and is constantly wrapped in a futon. Erio claims that she is an extraterrestrial life.

Du Ming, young anesthetist in a big Chinese hospital, is haunted by the memory of Zhang Qian: a young lady coming from the same school as him , who bewitched him by the sulphurous beauty and the aura of strangeness she emits. After graduating, Du Ming stayed in touch with Zhang Qian, who writes him. Now a terrible piece of news arises: the young lady is said to have committed suicide. From Manga-News.

The Vampire Bund, a peaceful island nation of vampires off the coast of Tokyo, ruled by Princess Mina Tepes, has seen its share of conflict and turmoil. Yet there are times of relative tranquility when the Bund is a popular tourist destination.
When two teenage tourists visit the Bund and are unexpectedly turned into vampires, they appeal to Mina and her loyal lycanthrope bodyguard, Akira, for help. Their only hope is to find a cure to reverse their vampirism within forty eight hours, or they will be stuck as vampires forever.
Unfortunately for them, their race against time turns into a game of cat and mouse that takes them across the entire Bund in pursuit of the one person who holds the key to their salvation.

The main characters are the sexy and voluptuous Atsuko and Kohei a young policeman who just made Detective. Atsuko is Kohei's boss and would do anything to get the bad guys. She even uses her body from time to time to catch or distract a criminal.

Tetsuo is a quiet and uncharismatic boy who is desperately in love with one of his classmates... who refuses to be his girlfriend. However, his feelings lead him to do anything for her; even become her puppet... What are the girl's true feelings?

The slice of life stories of newborn Yumeko Okiura, her mother Ayumi, and her aunt Kaname. Ayumi and Kaname endure the trials and tribulations of raising a newborn child, such as changing diapers and being awakened at odd hours. Not to mention, the stress of taking care of a baby opens rifts in their relationship. Both Ayumi and Kaname are 18, and the story occasionally reflects back to their time in high school.

Some more stuff to add to the Devilman mythos. This is Kinutani Yuu's second story about Go Nagai´s work.

From Storm in Heaven:

Everyone knows that Yugi Nonoka is crazy. Her classmates have ostracized her and her teachers have given up on her. Yet, while Yugi may seem messed to the world, she has a disturbing knack for knowing the messed up crap that other people are hiding. And she has the power to do something about it...

Badou's in trouble again. He's found some of the "Lost Children," rare genetic experiments left from the past--but so has the mafia. It's up to Heine to bail him out, but the Stray Dog has his own problems now that the enigmatic Giovanni is back on the scene. Meanwhile, Naoto comes to the Underground searching for the killer who wields the same strange black sword as hers. And so their paths begin to converge in the dark and dangerous heart of the city...

Contains an extra story called Dogs: Hardcore Twins in vol. 2.

Far in the future, humankind has evacuated the Earth in order to preserve it. Humans now reside in a gigantic structure that forms a ring around the Earth, thirty-five kilometers up in the sky. The society of the ring is highly stratified: the higher the floor, the greater the status. Mitsu, the lowly son of a window washer, has just graduated junior high. When his father disappears and is assumed dead, Mitsu must take on his father's occupation. As he struggles with the transition to working life, Mitsu's job treats him to an outsider's view into the various living-room dioramas of the Saturn Apartments.

Won the 15th Japan Media Arts Festival Grand Prize for Manga.

Kanan and Iori are a couple with a strange relationship. Iori always asks Kanan to physically hurt her.

In the horror of witnessing so many classmates perish before his eyes in a violent train wreck, Teru discovers two survivors in the tunnel: Ako and Nobuo. But salvation from this bloody carnage is far from their grasp. As they try to dig out from the wreck in order to come up with a plan to stay alive, the lack of light and food, combined with the stench of death and decay, will lead one member of the group down a dark and demented path. And with sudden, violent earthquakes shaking the tunnel, escaping to the outside world may lead them to an even greater danger.

Won the 21st Kodansha Manga Award for general manga in 1997.

The hero is Dr. Kishiwada, a brilliant but demented scientist, who creates bizarre mechas, battles the forces of evil, or just mucks about. There are many parodies of B-grade sci-fi movies and of TV. Crazy, slick, and very funny.

Like gods, doctors hold the lives of their patients in the palms of their hand. When doctors go bad who will stand up to them when the law is powerless? E.D.D is the fabled agency that works to rid society of these crooked men. When Dr. Kasahara meets his untimely termination from his hospital he is recruited to the ranks of this mysterious agency. Join Kasahara and Kojima as they Eliminate Dangerous Doctors.