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

Asamiya, Kia

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.

(Source: VIZ Media)

Silent Möbius

サイレントメビウス

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

Oze, Akira

The story tells about Hiroshi Shiba, a car racer who is mortally wounded on a laboratory accident, but restored to life by his father, Professor Shiba, a talented scientist/archeologist, who is incidentally investigating the relics of the ancient Yamatai Kingdom. The professor discovers a tiny bronze bell with sorcerous powers, and shortly afterwards he is murdered by the henchmen of Queen Himika, the ruler of the Yamatai (sometimes translated as Jamatai) Kingdom, who wants to seize the ancient bell and its power.

Koutetsu Jeeg

鋼鉄ジーグ

Okuse, Saki

The year is 2019, and Shinjuku's drug trade just got a whole lot bloodier. A new narcotic endows users with demon-like horns, fangs and a raging appetite for human flesh. When a man named Eiji Kuraza transforms into a murderous demon and then goes missing, his girlfriend Shizuka will stop at nothing to find him.

Following a trail of violence, narcotics and prostitution to the yakuza, Shizuka hires supernatural P.I. Tsunami for his expert legwork while Shizuka joins the red light district to conduct her own investigation on her back. If Shizuka's recklessness pays off, Eiji may force her to satisfy an appetite unfamiliar to call-girls...

(Source: Digital Manga Publishing)

Shihaisha no Tasogare

Twilight of the Dark Master

支配者の黄昏

Shibata, Masahiro

Komatsuzaki Ran is not a normal girl. Raised by wolves, psychic powers, the ability to turn into Akai Kiba (The Red Fang)...and a lot of people after her.

(Source: MU)

Akai Kiba: Blue Sonnet

紅い牙 ブルーソネット

Mizuki, Shigeru

When a 2nd moon suddenly looms overs Japan, the brave Professor Uetsuto volunteers to take a rocket up to the mysterious moon to investigate. Unfortunately the Professor meets a horrifying fate and is sent plummeting back to Earth.

The circumstances surrounding the Professor's fate are far too suspicious to ignore and his son, a student in biological science, decides to get to the bottom of the controversy himself.

Professor Uetsuto's devious rival, Professor Dorai, has other plans though and will stop at nothing to ensure the mystery of Professor Uetsuto's "demise" remains a secret.

Published in 1957 by Togetsu books, this was Mizuki Shigeru's very first Manga.

Rocketman

ロケットマン

Takei, Hiroyuki

In the year 2046, the existence of spirits is scientifically explained! At the same time, a mysterious disaster known as the "Night Parade of One Hundred Demons" occurs. Our protagonist, Shunsaku, rides a talisman-style motorcycle called "Juro" and confronts the most powerful spirits!

(Source: Shogakukan, translated)

Juro

呪ロ

Ishinomori, Shoutarou

In the far distant future, hideous monsters roam the Earth, threatening the lives of all people. Genma, the evil ruler of the Mah tribe, has become obsessed with fathering an Heir. Convinced that a child born of a Hito woman will have amazing powers, he sets his sights on a young Hito woman. In exchange for her village's safety, Non agree to bear Genma's child. She gives birth to twins and names them Loof and Jin. Jin is left for Non to raise among the Hito, as Loof is taken to Genma, and raised to be the prince of the Mah tribe. Although Loof and Jin live in two separate worlds, their fates soon become intertwined as Loof is banished from Mah tribe once he appears to possess more human than wizard physical characteristics. 

(Source: ANN)

Genma Taisen: Shinwa Zenya no Shou

幻魔大戦 神話前夜の章

Maki, Kouji

Keiko Myoujin is the daughter of a wealthy businessman and engaged to a rich guy that one day ends up setting a scheme to kill her whole family. She barely survives, as Igor, a notorious scientist from her father's company transplants her brain to a mechanical body and 15 years later she sets out on revenge to kill the ones who robbed her of her life and youth.

12 Manga Like Chou Kaguya-hime!