The main character is a detective, Kazuhiko Amamiya, suffering from Multiple Personality Disorder (a.k.a. Dissociative Identity Disorder). Starting out as a violent detective series with a twist (the twist being the variant personalities that take over Detective Amamiya at various intervals), the series evolves into an exceptionally complex and involved sci-fi conspiracy story.

Tatsuo, Hide, Satoshi and Aya worked together to cheat people out of money. They tended to target marriage services, where they con money out of people looking for love. They were good at it, until they crossed the wrong guy. Then they saw the world below the surface of dupes to cheat, when the 'collection agency' came for them with extreme violence.

The person who takes Satoshi and Hide, and then Aya and Tatsuo, is a wild-eyed maniac who seems to get off on the torture. There may be hope for Tatsuo, though, because the man recognizes him. The torturer is "Akasada" a bullied kid that Tatsuo knew from school. Now Tatsuo and Aya have been pulled, against their will, into Aka's world. [tethysdust]

From Viz:
In the 21st century, just when the human race needs new heroes, the Lucifer Hawks enter Earth's dimension. The members of the A.M.P., six young women with incredible powers, are set to defend the human race against these monstrous entities from another world.

A fantasy about a knight who lost everything and his story of survival strategy and territory restoration!

One day, when the lord's son, Agredios, came back to the village after a long hunt, the sounds of villagers bustling and their laughter were all gone. After learning that the "witch" that lives in the "Forbidden Forest" was the cause of their demise, his despair turned to rage and he stormed into the forest for revenge alone.

A mysterious mansion has towered proudly over the Tokyo district of Numanakarai since the Taisho period. Those who enter either never escape, or leave having experienced horrors untold, and with the desire to take revenge.

Anezaki Satoru, a Genius had his childhood friend murdered and raped, he then tracks down her 15 killers and he murders them, he then gets sentenced to death for his crimes of murder, after being executed though, he found himself in a parallel apocalyptic world...

The urban exploration of two teenagers causes them to run into a mysterious "box", which encloses those infected with a virus called "deadite". In that city, there is a teacher named Katsuragi Zakuro. Which hides a secret...

The older brother, imprisoned by his sister, dies just as he escapes and is reincarnated in another world!
He thought he had been freed from his demonic sister, but now she too has been reincarnated in the same world...?

WN Raw: https://ncode.syosetu.com/n7437dj/

Yuuji is a genius at track and field. But he has zero interest running around in circles, he's happy as a clam in the Occult Research Club. Although he's only in the club for kicks, things get serious when a real spirit shows up at school! Life's about to get really strange in Sugisawa Town #3 High School!

Cha Hyeon-seong was a boy who had a life full of pain and suffering. One day, he was murdered by beasts of unknown origin, yet he was resurrected and awakened from his death. In front of him was Son Ga-young, a hunter going after him and the beasts. After this began Hyeon-seong’s struggle for survival in the middle of a constant battle between the two groups - the humans and the beasts.

"You... are going to die tomorrow."

Minadzuki Satsuki, 16 years old. Apart from being antisocial and declaring the death of her classmates, she is a normal high school second-year student. Her nickname is "Liar Satsuki".

However, her eyes alone are abnormal. What she is gazing at is...

Twitter of the author : https://twitter.com/ryo_ichips

In a world entirely ruled by giants, the human race, which has turned into their food, has surrounded its residential zones with immense walls, which both prevent their freedom outside the walls and protect them from incursions. However, as a result of the appearance of supergiants who cross the wall, a desperate struggle begins and the young heroes, who have lost their parents, fight the giant as a training corps, with a view to regaining their freedom.

Note: Won the Kodansha Manga Award in the shōnen category in 2011, was nominated for the 4th annual Manga Taishō award and also for the the 16th and 18th annual Tezuka Osamu Cultural Prize.

In Tokyo, suspicious cases are occurring where the victims have all of their blood drained from them.
Mikogami Keiji, a detective who also wants revenge for his lover, killed 10 years ago, pursues the culprit, the “Man with two faces”.
What is the identity of the silver-haired girl who observes him…?

The "academy love suspense" story is about a "love harem game" set in a real academy that was promised to a boring boy. However, in this harem scenario, the heroines will start a bloody battle.

From MangaHelpers:
This manga tells the story of Hatshepsut, a woman who reigned successfully over Egypt for many years. The story begins when she is a young woman, marrying her half-brother Thutmose II and thus ensuring his rise to Pharaoh. Hatshepsut is a woman with a strong will, who is not going to accept the restrictions others might try to place on her as a woman.

This is the story of Misora Haebaru, an 18 year old karate expert from Okinawa who went to Tokyo to enter the entertainment industry in hopes of supporting her family. She gets tricked into being a gravure idol who wears lewd clothing and is forced eventually to enter the AV world, but she wont go down without a fight.

This is the legendary Go Nagai's breakthrough work. Harenchi Gakuen is an elementary school whose teachers and students are all perverts. Boys peep girls changing. Girls pull up their skirts and show off their panties. Actually, it's not as evil as you imagine. They're like cubs playing together. It's only pre-school eroticism, nothing sexual. In spite of that, Harenchi Gakuen became a sensation. Parents, teachers, and politicians hysterically attacked the comic's immorality.

The “Youth War Drama” takes place on the chaotic frontline of countries at war. A certain person stands at the head of a combat team that is sweeping across the land. The story follows the strong and fleeting emotions of the young people whose lives are scattered on the battlefield.

Gen Suzuki, a young man who grew up in an orphanage, is trying to live an honest life. But when the cruel reality of the 10 million yen debt from her sister hits him, he decides to rob a Dark Casino. What awaits him is the baptism of the underworld!

Housen is a painter of erotic art in the Edo period, who stumbles into a murder mystery involving women who have hooked up with one of his patrons. With the help of Tsubaki, a girl he runs into on the street who seems to know more about him than he does and is an artist herself, they start unraveling mysteries involving sex, murder, and occasionally the occult...