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

Nagai, Go

Soft-hearted Akira Fudou has always been somewhat of a pushover. When he reunites with his childhood friend, Ryou Asuka, in a fateful encounter, Ryou reveals to him the terrifying reality of his father's research: demons exist and are planning to claim possession of the earth once again.

Eager to help his friend save humanity, Akira agrees to attend Black Sabbath, a party filled with depravity and corruption, to attempt to merge with a demon. A near-death encounter causes him to unify with Amon, a demon feared amongst even his own kind. Together they form Devilman, a combination of Amon's strength and Akira's pure heart.

After uniting with Amon, Akira begins to fight against the demons with his newfound power, desperate to stop the downfall of all human civilization.

[Written by MAL Rewrite]

Devilman

デビルマン

Fujisaki, Ryuu

Ono, Fuyumi

Nothing ever happens in the village of Sotoba. In fact, it is viewed as nothing more than a hick town by its most outgoing and fashionable resident, Megumi Shimizu. She wants nothing more than to live in the city, far away from the villagers and their outdated ways of thinking. So when a new European-style house is built on a hill in the village, Megumi believes its residents must be cultured and refined, so she decides to pay them a visit.

However, Megumi doesn't return home that night. After a grueling search, she is found the next day, weak and anemic, with strange bite marks on her. But Megumi is just the first victim in what will soon become an epidemic in Sotoba as the bodies start piling up. The village doctor Toshio Ozaki, along with the priest Seishin Muroi, the loner Natsuno Yuuki, and the Tanaka siblings Kaori and Akira, begin investigating the strange deaths. But the answer to their predicament may be more than any of them can handle, for soon the dead could outnumber the living.

[Written by MAL Rewrite]

Shiki

屍鬼

Osuga, Megumi

Isaka, Koutarou

Andou is a high-schooler who possesses the ability to force others to vocalize his thoughts—an ability similar to ventriloquism. Inukai is young man shrouded in mystery who commands the vigilante group, Grass Hopper, which appeared in a city shaken by the downtown restoration program. This is a tale of courage, resolution… and confrontation; this is a depiction of the two boys' encounter.

(Source: Aku Tenshi)

Maou: Juvenile Remix

Maoh: Juvenile Remix

魔王 JUVENILE REMIX

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+

Mitsunaga, Yasunori

Werewolves, demons, monsters, vampires. All these ferocious creatures are afraid of the same thing: the beautiful Princess Hime, an awesome warrior who fights off the forces off evil with a chainsaw and a smile. Not only does she look great in a tiara, she has magical powers that allow her to raise the dead. She's a girl on a mission, and with the help of her undead servant and a supercute robot, there's no creature of darkness she can't take down!

(Source: Del Rey)

Kaibutsu Oujo

Princess Resurrection

怪物王女

Ueda, Shinshu

When Naoya Toudou is goaded into playing a childish fortune-telling game called "Persona," the last thing he expected was to summon a girl pleading for help. The girl's wails overwhelm Naoya's senses, leading him to awaken in a strange place that exists between consciousness and unconsciousness where a mysterious entity resides. Introducing themselves as Philemon, they grant him the ability to wield a "Persona"—a being that exists as an "other self"—before he wakes up in the school's infirmary.

Though Naoya's friends also recall meeting the same entity, they think nothing of it as they head to the hospital to see their sick friend, Maki Sonomura. During their visit, Sonomura disappears in the middle of her surgery and the patients within the hospital suddenly become hostile. Cornered, the group members each call forth their Personas, who fend off the rest of the assailants much to their surprise.

Concerned for their friend, the group sets out to find Sonomura all while gathering more information about the ominous situation they are in.

[Written by MAL Rewrite]

Megami Ibunroku: Persona

女神異聞録 ～ペルソナ～

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

PEACH‐PIT

Michiru Kita’s a weak-spirited girl who has a hard time saying what’s on her mind. One day, she notices mysterious, ring-like markings around the necks of two of her classmates, Chika Akatsuki and Shito Tachibana — two boys who miraculously survived a horrible accident six months before. Michiru, possessing the rare ability to see these rings, knows that they warn of impending death. Thinking that, perhaps, she can do something to save her classmates’ lives, she approaches them... but it seems the boys have already made a different kind of deal and garnered themselves a heavy debt 

(Source: Yen Press)

Zombie-Loan

ZOMBIE-LOAN

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

Akahito, Yoshiichi

The story starts off with a bunch of high school students, taking the dare to go up to this abandoned building that has been half destroyed by a fire. It was rumoured to be haunted. Just a rumour, right? Not when real corpses start showing up, and they start feeling things grabbing them, and finally zombies going after them! Shikabane Hime is there to save the day. The immortal girl, "Shikabane Hime," has the mission to "kill" 108 corpses. It's a contract she has between herself and the Buddhist monk, Keisei. After 108 corpses, she will finally get her happiness and go to heaven.

(Source: MU)

Shikabane Hime

Corpse Princess

屍姫

Sugimoto, Iqura

After seeing her family slaughtered, Aiko is surprised to wake up on a laboratory table, apparently intact. But when she notices the horribly disfigured arm grafted onto her body, she soon realizes that life as she knew it before the attack is now over. Infused with the DNA of a mysterious monster known as Chimera, the arm acts on the urges of its master—leaving Aiko powerless to stop it. Alone and frightened, how will she deal with this horrible fate?

(Source: CMX)

12 Manga Like Majo no Migite