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

Adachi, Mitsuru

The story is set in a place very similar in appearance to Earth in the Edo period. However, Adachi (the mangaka) regularly reminds the reader all throughout the series that the setting is another planet in the distant future which just happens to look like Earth.

After the death of his mother, Shichimi sets out to join his step-brothers and -sister who live together in Karakuri Tenement, a place provided by the father they have never met. He finds out that each of them had different mothers (all of whom have died), but were fathered by the same man. Not long after Shichimi's arrival, the siblings decide to journey to visit the graves of each of their mothers. On this journey, they encounter many dangers.

(Source: Wikipedia)

Nijiiro Tougarashi

虹色とうがらし

Tezuka, Osamu

After the cruel lord Daigo Kagemitsu sells his newborn son's body parts to 48 demons in exchange for power, he casts what remains down a river and quickly forgets about his son, soon establishing a mighty kingdom. Little does Daigo know that his child survives, possessing advanced spiritual senses that allow him to navigate the world without eyes, ears, limbs, or even a voice.

A brilliant doctor rescues the son and raises him as his own, naming him Hyakkimaru and fitting him with advanced prosthetics that make it possible for him to move and fight. However, tragedy strikes when Hyakkimaru turns out to be a beacon that brings demons into the doctor's home, and the doctor eventually has to send Hyakkimaru out into the world.

Amid his travels, Hyakkimaru learns that slaying demons allow him to recover his missing parts and seeks to kill enough to make himself whole. He soon encounters Dororo—a boy claiming to be the world's greatest thief—who joins Hyakkimaru against his will in hopes of one day obtaining his sword. Together, the duo travels through a countryside infested with both demons and brutal men, who might prove to be worse.

[Written by MAL Rewrite]

Dororo

どろろ

Ishikawa, Ken

The first Getter Robo series chronologically published 15 years before the rest of the manga. Getter Robo pioneered the idea of the combining and transforming robot.

Millions of years ago, the dinosaurs were driven deep underground due to the sudden arrival of "Getter Rays" on Earth. After evolving into sentient beings, they grew bitter and vengeful at the humans who replaced them on the surface and began plotting their attack on humanity.

Fighting against them is Getter Robo, a machine built by Professor Saotome which uses the mysterious Getter Rays as its power source. Piloting it are three strong-willed young men—the violent martial artist Nagare Ryoma, the psychopathic yet highly intelligent revolutionary Jin Hayato, and the hot-blooded judo master Tomoe Musashi. Each controls one of three specially designed combat jets which can be combined together in different forms to form three different kinds of giant robots: the flying, axe-wielding Getter-1, the quick, drill-wielding Getter-2, and the tough, tank-like Getter-3.

Getter Robo

ゲッターロボ

Takemiya, Keiko

Mitsuse, Ryu

Cosmoralia's Prince Ithaca is about to wed Princess Lilia of Ayodoya and be crowned Astralta III. The apparently favorable celestial bearings mean he will be no mere monarch but holy king of a new "papacy." Alas, the peaceful inhabitants of Planet Astria have no clue that they're next in line for invasion by a ruthless machine force—a threat that seems to metaphorize the inherent perils of politics and desire in the multi layered saga.

Andromeda Stories

アンドロメダ・ストーリーズ

Ishinomori, Shoutarou

Hayate’s father, Tani no Maju (another loyal “Chiguruma Tou” clansman) had discovered and developed the “Ninja Henshin Jitsu” (Ninja Transforming Magic/Techniques) that enabled man to transform into super powerful “Keshin Ninjas” (Spiritual Ninjas) who would be able to summon and utilize their own inner mystical powers. Majin Sai wanted to use this technique to further “Chiguruma Tou’s” cause and make their warriors invincible. Tani No Majyu resisted handing Majin Sai the secrets to this technique believing that in the wrong hands, this technique could pose a monumental threat to Japan. Majin Sai sent one of his “Youkai Ninjas” (Supernatural Ninjas) to steal the secrets of this technique. In the process Tani No Majyu was killed but not before he had shown Hayate the secrets of this process. Enraged, Hayate uses these techniques to tap into his inner mystical powers and becomes the super powered ninja “Arashi” (Storm).

(Source: MU)

Henshin Ninja Arashi

変身忍者 嵐

Katsura, Masakazu

1. Zetman
2. Shin-no-Shin: Ai to Nikushimi no Time Slip (Shin-no-Shin: A Time Skip of Love and Hate)
3. Woman in the Man: Otoko no Naka no Onna
4. Shadow Lady (pilot)

Zetman

ZETMAN―桂正和短編集

Iwata, Kazuhisa

Something monstrous rises up from the sea and nearly sinks a Japanese fishing boat. The sole survivor tells a tale that no one wants to believe. 

But when a Russian nuclear submarine is destroyed in the same waters, the world is forced to face the truth: Godzilla has returned! This manga classic was originally published by Dark Horse in black and white in 1988

(Source: MU)

Godzilla

ゴジラ

Otemoto

Gunyuu wo Tsuzuru

群雄を綴る

Murakoshi, Tatsu

In the modern age, the true nature of demons and yokai has come to light. They are mayori, "demon-touched" humans who returned from the otherworld with supernatural powers. Sagume, an oni mayori, was isolated at school and lost sight of the dazzling youth she'd dreamed of. Years later, she sets out to reclaim the youth she once let slip away...! (Source: MANGA Plus)

Mayori no Gakkou

Mayori Academy

魔寄りの学校

Kobayashi, Tatsuyoshi

After a terrorist bombing takes the life of his only daughter, reknowned bio-geneticist Professor Shinigami merges her cells with those of her favourite rose in life. When the rose is almost destroyed in an earthquake, he also bonds Godzilla cells, which the Japanese government gathered for study after The King Of The Monsters last raid on Japan, to the plant to make it immortal.
The same terrorists want the G-cells, and threaten to unleash Godzilla once more if the Japanese government fails to give in to their demands.
Soon, Godzilla returns and makes his way towards the genetically altered plant, which has now mutated into the colossal horror called Biollante!

Godzilla vs. Biollante

ゴジラvsビオランテ

Uno, Hiroshi

At the end of 19th Century, Captain Drake, the pirate who traveled all over the world died. Rumor has it that he hide his treasure that is worth thousand millions pounds away from people. The map to this treasure is being torn into 2 parts. One part of it is owned by the military, lead by Colonel Visconti. The another part is owned by Drake's son. 

That young boy's name is Captain Kid, and with his Black Lightening sword and Kid's cunning crews the journey to find Captain Drake's hidden treasure begins.

12 Manga Like Owari no Seraph