Maybe

A young woman, by some strange occurrence, was left to die alone in the former building of Seikyou Academy. Mysteriously, there is one person who can see her in ghost form: Teiichi Niiya, a freshman. Now they both seek to find out the reasoning behind her death, and what could have caused it.

(Source: DBR Scanlations)

Tasogare Otome x Amnesia

Dusk Maiden of Amnesia

黄昏乙女×アムネジア

Katsura, Asuka

Saya, the main character, lost her memory and has been living with her adopted family. Her everyday life seems quite normal, except that she eats a lot more than she actually needs. Then one day she meets a guy named Hagi in a park. She is told that he has been searching for her, for a long time. Since then, her normal life has changed completely.

A high school girl named Saya can not remember anything from her past. A handsome young man, Hagi, appears and something seems familiar about him. This girl is more than human with an ancient and mysterious past. She will hunt down and kill the monsters called Chiropterans.

(Source: MU)

Blood+

Takahashi, Rumiko

There is a legend that says if someone eats the flesh of a mermaid, they will attain immortality; but this myth contains a darker side, in that the devourer may die or become a monster. 

The youthful Yuta has been wandering Japan in search of mermaids not to become immortal, but to break his curse of eternal life. Over five hundred years ago, he ate a mermaid; now, Yuta is in search of a cure, hoping the mermaids know the secret. When he stumbles upon a hidden village, he quickly learns that it is full of mermaids that live in an underground society centered around the murder and cultivation of young human women to maintain their own youth and immortality. 

Their most recent victim, Mana, is given the flesh of a mermaid to eat in order to fulfill the recipe toward being a perfect candidate to be eaten. Yuta helps her escape, and they find themselves on a journey to live their lives as normal as they can.

[Written by MAL Rewrite]

Ningyo Series

人魚シリーズ

Kamiya, Yuu

Kagami, Takaya

A freshman of Miyasaka High, Kurogane Taito was average at everything. And all this while, he had believed himself to be an ordinary regular guy. But, he was wrong. The reason was because of a certain event 9 years ago. For the sake of a promise he had made then, he had already stopped being ordinary a long time ago. However, not a single fragment of his memory about that promise remained. Who had stolen his memory and to what ends? One day, as a consequence of a certain event that had descended upon his ordinary life, his memories were restored. That marked the beginning of his “extraordinary” life...

"You’ve finally died. I’ve been long waiting for this day."
I’ve always thought that I’m a supporting character in life.
But once again, it starts from here.
My story.
I’ll “die 7 times” for your sake

Everything starts from that promise. A story of a reverse school fantasy!

(Source: Baka-Tsuki)

Itsuka Tenma no Kuro Usagi

いつか天魔の黒ウサギ

Esuno, Sakae

Folklore detective Asou Daisuke would rather deal with normal, everyday, things like cheating spouses, embezzling partners and the like. Because whenever he deals with the supernatural, he gets the hiccups.

But no matter, an endless stream of desperate people come to him troubled by what he calls allegories. Those are stories, usually urban legends, that one believes to be true and if one believes strong enough can cause them to become true. His first case involves "The Man Under The Bed." Can he stop this creepy man with an axe before he chops up Hiranuma Kanae? Why does Asou count his hiccups and just who is that strange girl in his bathroom?

(Source: MU)

Hanako to Guuwa no Teller

Hanako and the Terror of Allegory

花子と寓話のテラー

Watsuki, Nobuhiro

A story based on the concept of Frankenstein. The late scientist Victor Frankenstein's papers on the creation of a "frankenstein" are being put to use, and Fury Flatliner, motivated by revenge, sets out to kill them and their creator.

(Source: Easy Going Scans)

Embalming: The Another Tale of Frankenstein

エンバーミング -THE ANOTHER TALE OF FRANKENSTEIN-

Fuyuki, Nea

In a field of green stands a single castle. One night, the residents sense that something is amiss. Suddenly a doll starts moving, and the residents disappear one after another. Thus, a young girl is left alone inside the mansion...

(Source: Square Enix, translated)

Inada, Shiho

Ono, Fuyumi

Mai Taniyama's school has an ancient, abandoned, and allegedly cursed building. Whenever it is about to be torn down, a series of unsettling deaths occur and halt the demolition. To prove it is haunted, Mai and her friends try to summon a specter by telling ghost stories. No ghosts appear, but the group encounters Kazuya Shibuya, a 17-year-old transfer student. Though her friends are charmed by Kazuya's attractive looks and great manners, Mai does not trust him.

Following a mishap, Mai discovers Kazuya's real identity as the president of Shibuya Psychic Research, a group hired by the school principal to investigate the building's rumored paranormal activity. As a consequence of her actions, Mai must temporarily help Kazuya if she does not want to pay him damages. Joined by other individuals experienced with the supernatural—former Buddhist monk Houshou Takigawa, self-proclaimed Shinto priestess Ayako Matsusaki, famous medium Masako Hara, and Catholic priest John Brown—Mai and Kazuya must uncover the mystery surrounding the building before any more innocent lives are lost.

[Written by MAL Rewrite]

Ghost Hunt

ゴーストハント

Type-Moon

Nasu, Kinoko

Sasaki, Shonen

Shiki Toono awakens in a hospital to find the walls and people around him covered in black lines. Unable to recall his past memories, Shiki is told that he survived a fatal car accident, which left a fragment lodged into his chest. His attraction to the lines lead him to trace over an object, revealing his ability to destroy it. After realizing only he is able to see these lines, Shiki is given a pair of glasses to mask them, before starting a new life with his relatives.

Eight years later, the death of his father leads Shiki back to the Toono mansion, his childhood home. One day, leaving school due to anxiety, he passes by a mysterious woman. A sudden urge overtakes him, and once again, he uses his ability to trace the lines that cover her. Soon after, he wakes up in the mansion, questioning whether what had transpired was a dream or reality.

Shingetsutan Tsukihime tells a tale enveloped in adventure, romance, and mystery. As Shiki begins to unveil his past, what lingers in the unknown soon comes back to haunt him.

[Written by MAL Rewrite]

Shingetsutan Tsukihime

Lunar Legend Tsukihime

真月譚 月姫

Yuki, Kaori

In this grim and realistic take on classic fairy tales, Prince Ludwig, a female corpse collector, is ordered by his father to find himself a wife more suitable than the women he often brings into the castle. Along with his servant Wilhelm, they travel across the land in search of fair maidens from classic stories in hopes of finding Ludwig a wife.

(Source: Aerandria Scans)

Ludwig Kakumei

ルードヴィッヒ革命

Sunao, Yoshida

Shibamoto, Thores

The background is in the distant future, a post-apocalyptic world after the destruction brought about by Armageddon. The war between humans (Terran) and vampires (Methuselah) continues, as a struggle between two factions: the Vatican and the New Human Empire.

Yet, amidst the bloodshed and violence, many desire a peaceful co-existence between the two species. However, standing between them and this goal is the Rosenkreuz Orden, a group of vampire extremists who manipulate the two sides and pit them against each other. To combat them, the Vatican special operations group "AX," led by Cardinal Caterina, must use everything they have—even a vampire who preys on the blood of other vampires.

(Source: Tokyopop)

Trinity Blood: Rage Against the Moons

トリニティ・ブラッド Rage Against the Moons

Ima, Ichiko

Ritsu inherited his sixth sense from his grandfather, along with a demon guardian named Blue Storm. Strange things just seem to happen around these two, and it's left to them to get to the bottom of all these mysterious events. Each story is independent but features recurring characters you'll come to know and appreciate as they, each in their own way, try to deal with things 'not of this world'.

(Source: MU)

Manga Like Bonba!