Tsukumo, Mutsumi

A classic yuri manga about a woman who leaves her husband for an old friend from school. There are two stories in this manga--one (Moonlight Flowers) is the main story, and the other (Midnight Flowers) is about the protagonist's friend's past.
Note: this manga contains rape.
(Source: Lililicious)

Also includes another unrelated story.

Moonlight Flowers

月下美人

Fujikawa, Touko

Shinobu grew up in a town so small that he didn't even have any classmates in elementary school. Without any friends his age, he spent his time learning about flowers with a local horticulture expert. Now that he's moved away to a city, he still sticks to himself, since he never really learned how to make friends. That is, with the exception of Yukihito, who came up to him one day and became his friend. The trouble is, now Yukihito means the world to Shinobu, and he doesn't know what to do about it. (Source: Storm in Heaven)

Natsu, Kimi ga Saku

夏、君が咲く。

Wako

Imagine if there was a place for women to go, where there were beautiful women to cater to their needs, to help them relax, cast off their world-weariness and find themselves in an aura of refined luxury and sensuality. 

Welcome to the Miracle Palace.

Kiseki Goten

The Miracle Palace

Itou, Junji

1. Yaneura no Nagai Kami (Long Hair in the Attic)
2. Yurushi (Approval)
3. Hachi no Su (Beehive)
4. Hakumei (Dying Young)
5. Kubi no Nai Choukoku (Headless Sculptures)
6. Nikuiro no Kai (Flesh-Colored Horror)

Itou Junji Kyoufu Manga Collection: Nikuiro no Kai

Junji Ito Horror Comic Collection Flesh-Colored Horror

肉色の怪

Takada, Yuuzo

Through a strange series of events, a young man named Yakumo Fuuji becomes the immortal slave of the last of a race of 3 Eyed immortals. The immortal, Pai, absorbs his soul to save his life, making him immortal in the process. Now, he begins a journey with the female immortal in an attempt to find a way of becoming human. Of course, there are many complications along the way, not the least of which being that the immortal is a female with a split personality, one achingly cute and the other being no-nonsense destructive power, and romances that develop between.

3x3 Eyes

3×3 EYES

Tooru Oshikiri is a quiet boy of short stature and few friends. While his parents are out working abroad, he lives alone in a big mansion, compounding his loneliness and affecting his grip on reality. Moreover, strange things tend to happen to him and those he gets involved with. Grappling with harrowing hallucinations of long-necked people, a haunted bog rumored to trap its victims, a strange girl with even stranger penpals, and the mysterious circumstances within his own house, it seems the supernatural is all but an inevitable occurrence for Oshikiri. Yet with each inexplicable occurrence, his reality alters slightly between the last. Just what is the truth behind these discrepancies? Is this really happening to the same Oshikiri?

[Written by MAL Rewrite]

Itou Junji Kyoufu Manga Collection: Kubi Gensou

首幻想

Tezuka, Osamu

After the first moon landing, many people's tolerance for fantasy faded in favor of gritty realism. Nobody has been more keenly aware of this shift than Imari Daisuke, once a celebrated film director now shelved for being too avant-garde. When a strange fortune teller tells him to visit a lavish home, promising that he can live there, Imari obliges but is met by the enigmatic Count Alucard.

The Count has a mission for Imari: become a director of life and utilize his unique skillset to cause bizarre incidents, allowing the spirit of mystery to return to Earth. To this end, he is provided with I.L, a perfect actress who can completely change her appearance by entering a magic coffin. Together, the duo takes on clients in need of a body double—though they often end up providing services that do not exactly meet the client's expectations.

[Written by MAL Rewrite]

I.L.

アイエル

Yasuhiko, Yoshikazu

The young Arion is tricked by Hades and is taken to the underworld where he is trained to become a warrior strong enough to defeat even a god. Thrusted into a war among the Titan brothers, Arion embarks into a colossal saga towards the Olympus, home of Zeus.

This is the story of Arion, a little boy raised by only his blind mother in a barren land. One day a man comes to visit his mother. This man calls himself Arions uncle and Arions mother calls the man Hades. The uncle convinces Arion that he knows where Arion can get a hold of a special herb that can cure Arions mothers eyes, and so the boy willingly comes with his uncle Hades on a journey. The moment Ariona agrees to go, his mother feels it in her heart and rushes out of her little house and screams at the sky ; Zeus, your brother is taking Arion to the land of the dead. Follow Arion on his adventures among old greek gods and godesses.

(Source: ANN)

Arion

アリオン

Yamada, Akihiro

On the outskirts of Neo-Hong Kong lies a mysterious Chinese-style garden. Legend has it that anyone who looks upon the fairy of the garden will die before the night is out.

Five years ago, Douglas Pyke was charged with discovering the true nature of this fairy, but when he accidentally killed a woman in the line of duty, he left the police force forever. Now, a cabbie and sometime private eye, he is asked to find a missing scientist and confront the mysteries of the garden once more.

Hyakka Teien no Higeki

Full Flower Garden; Tragedy of the Garden of Many Flowers

百花庭園の悲劇

Ogino, Makoto

A young mystic without a past, Kujaku was born under a dark omen possessed of incredible supernatural powers. Raised by priests, he has learned to use these powers for good. But the evil Siegfried von Mittgard seeks to steal his birthright, and rule the world as the Regent of Darkness. He has dispatched bloodthirsty minions to destroy Kujaku before he can awaken to his destiny. Now, Kujaku must unravel the riddle of his past, before the power within consumes him!

(Source: AniDB)

Kujakuou

Peacock King

孔雀王

Kamimura, Kazuo

Nakajima, Sadao

Hijiriko is a girl in an everlasting search for love. She goes from one man to another, from one relationship to another, in an attempt to find her soulmate. Since she becomes aware of a passage from Plato's Symposium—the one that talks about the myth of the two halves—Hijiriko is almost obsessed with it. Until the day she meets the young Oikawa: passion erupts between them, and a bond is formed that will lead them to taste all the nuances of love: infatuation, passion, jealousy, madness, and revenge.

(Source: Coconino Press, translated)

Manga Like Blue Drop: Tenshi no Bokura