From Dangerous Pleasure:

Nao and You are cousins. You began to live with Nao’s family after he was abandoned by his own mother. Ever since then, he is always together with Nao and Nao’s childhood friend, Haruki. Haruki enjoys spoiling Nao and even though You is stern with his words, he is always gentle to Nao too. As time goes by, Nao finds himself being attracted to You, and both You and Haruki finds themselves falling more and more in love with Nao. But one day, out of the blue, their love became something that cannot be conveyed?

Every year, Lord Nicola A. Bradherley, one of Europe's leading aristocrats, sends his coach round to various orphanges to adopt young girls and trains them to join his opera troupe. But most of these girls never make it onto the stage a far more sinister fate awaits them, sacrificed in the name of the greater good.

Apollo’s Song follows the tragic journey of Shogo, a young man whose abusive childhood has instilled in him a loathing for love so profound he finds himself compelled to acts of violence when he is witness to any act of intimacy or affection whether by human or beast. His hate is such that the gods intervene, cursing Shogo to experience love throughout the ages ultimately to have it ripped from his heart every time. From the Nazi atrocities of World War II to a dystopian future of human cloning, Shogo loses his heart, in so doing, healing the psychic scars of his childhood hatred.

Consists of 4 oneshots.

The year is 1850. A child with skin and hair as white as the moonlight is born in a Sioux Indian village. Despite the villagers' opposition, the Chieftain decides to keep the child...

Michio Yuki has it all: looks, intelligence, a pedigree as the scion of a famous Kabuki family, a promising career at a major bank, legions of female admirers. But underneath the sheen of perfection lurks a secret with the power to shake the world to its foundations.

During a boyhood excursion to one of the southern archipelagos near Okinawa, Yuki barely survived exposure to a poison gas stored at a foreign military facility. The leakage annihilated all of the island’s inhabitants but was promptly covered up by the authorities, leaving Yuki as an unacknowledged witness—one whose sense of right and wrong, however, the potent nerve agent managed to obliterate.

Now, fifteen years later, Yuki is a social climber of Balzacian proportions, infiltrating the worlds of finance and politics by day while brutally murdering children and women by night—perversely using his Kabuki-honed skills as a female impersonator to pass himself off as the women he’s killed. His drive, however, will not be satiated with a promotion here and a rape there. Michio Yuki has a far more ominous objective: obtaining MW, the ultimate weapon that spared his life but robbed him of all conscience.

There are only two men with any hope of stopping him: one, a brilliant public prosecutor who struggles to build a case against the psychopath; the other, a tormented Catholic priest, Iwao Garai, who shares Yuki’ls past—and frequently his bed.

Kuuki no Soko is a collection of short stories drawn by the genius mangaka, Tezuka Osamu, between 1968 and 1970, and is known in Japan as a true masterpiece.

Belonging to Tezuka's most mature period, it touches many genres: from pure science fiction to historical fiction to contemporary drama. We find stories of industrial espionage, animal testing, and racial animosity, as well as stories about the more complex dynamics of the human mind.

And the human mind is the leitmotif of the entire volume, namely the duality present in every one of us - mercy, love, and understanding, existing together with cruelty and violence until something upsets the balance and we discover a side hidden even from ourselves... a side we are not always prepared to confront...

Note - Chapters 1 and 13 are also included in Clockwork Apple
1. The Execution Ended at Three
2. Joe's Visitor
3. The Voice of Night
4. The Cliff of Death
5. The Duel at the Grand Mesa
6. Scales Cape
7. Illicit Love
8. The Hole
9. Star for Exiles
10. The Cat's Blood
11. Telephone
12. Chameleon
13. Immaculate Conception
14. Catastrophe in the Dark
15. Robanna
16. Space Capsule

The Sleepless King summons young ladies to the palace every night and make them tell him bedtime stories, and the penalty for failing to lull him to sleep is death. The one who finally managed to sooth the king to sleep is Lady Farasha, who volunteered as the storyteller in order to save her imprisoned father. But how was she able to accomplish the impossible? Is there more to the relationship between the Sleepless King and Lady Farasha than what meets the eye?

At the age of sixteen Ryo Narushima was a genius and looked to have no trouble of getting into Tokyo University and joining the elite of society. However, that summer something cracked inside Ryo's head. With a small knife he brutally murdered both of his parents only leaving his sister alive and cowering in a corner. It is at this grotesque incident that our story begins.

Note: The series has been completely written & drawn by Tanaka Akio from ch.61 in Vol.26, which was the first chapter after a long hiatus, and the original author Hashimoto Izou wrote less and less starting from Vol. 4.
The series changed publishers, which lead to a restart of the chapter numbers, with Vol.20.

In an RPG-esque world where people's positions in society are decided at birth, Tolza is a "subjugator" who's on a quest to defeat the demon king. He meets and teams up with various people during his adventures, though the dangerous nature of their world means that many of them die. However, as a subjugator Tolza possesses a special ability which he keeps secret at all cost: he gets stronger every time one of his companions dies.

From Perpetual Dreams:

7th grader Oshiro Shinobu, the daughter of one of Japan's old family lines, was separated from her parents due to certain circumstances when she was only six. Because of this she now lives with one of her distant relatives, Kouda Shougo, who is a teacher at the school she now goes to. Apparently, a childhood friend by the name of Oku Saizou is transferring into Shinobu's class, but wait... This timid and hesitant boy is actually a ninja who serves Shinobu and he has transferred for the sole purpose to protect her...?!

The meeting between two cold beauties -- the ambitious Ai and the impulsive Tomo -- and the complicated relationship that blossoms between them.

Cross Academy is attended by two groups of students: the Day Class and the Night Class. At twilight, when the students of the Day Class return to their dorm, they cross paths with the Night Class on their way to school. Yuki Cross and Zero Kiryu are the Guardians of the school, protecting the Day Class from the Academy's dark secret: the Night Class is full of vampires!

A collection of illogical plot lines.

A boy's terrifying dream that brings an end to a humanity that is rotting. A high school student named Gi Haru, who has an illness that prevents him from differentiating between reality and delusions. His only friends are his studious friend Kang Yul and girlfriend Kang Lee Ha. However one day, after seeing a hallucination of a Nazi assembly during his friend Kang Yul's poetry recitation, the school falls into a pandemonium of hell where everyone is killing each other, but Gi Haru believes it to be another one of his delusions. However, that was the blunt truth. That day, where the mass murder of the entire student body took place, (The starting day) Gi Haru kills his girlfriend Kang Lee Ha with his own hands, is betrayed by his one and only friend Kang Yul, and ends up losing both his eyes. Afterwards, he was detained in a mental institute as the culprit of massacring the entire student body, but after receiving help from the capable group of the Panthers he begins to chase after Kang Yul and begins the road of vengeance.

"Don't cry, Dana will take away your sadness. Because this is Dana's Garden." With those words, young Ling-Ling comforts the crying boy, Jerome. But who is Dana, and can she really help Jerome overcome the grief of losing his mother?

After his master Goomonryong destroys his ki-center, Shioon leaves the world of the Murim for a normal life to which he believes his master was trying to return him. But for a boy who holds the Phoenix medallion of the Sunwoo clan and the knowledge of the Black Heaven & Earth Technique, the world of the Murim will come to him... Continuation of The Breaker with new allies and enemies.

Manhwa you may like:
+ The Gamer
+ Gosu
+ Yongbi

A port town where the Mafia actively operates behind the scenes.
Gohongi is a young man who has come back to this to place where he was born after many years and finds a job working at a video rental store, which also becomes his new home.
It is here that he begins to live with a young girl named Mei and a homosexual by the name of Katsura.
But both of them are members of the Mafia group, Lovely Town.
And fifteen-year-old-Mei is a ruthless hitman.
There have been rumors that the struggles between Mafia factions are becoming more intense.
Still not able to completely grasp the situation, Gohongi winds up getting dragged into a world of trouble...

Yuuki and Michi -- two childhood friends who drifted apart are reunited inside a mysterious train.