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

Ishinomori, Shoutarou

The manga version of the live action Robot Keiji tv series.

The story is about a robot named Robot Detective K dressed in a human Detective outfit fighting kaijin.

Robot Keiji

ロボット刑事

Shimamoto, Kazuhiko

1. Kamen Rider Black
2-4. Kamen Rider ZO
5. Tenka Osamu Monogatari

Kamen Rider ZO

仮面ライダーZO

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

Kamiya, Yuu

Dool and Tatsuki are a demon hunters. Living like ordinary people in the daylight, they secretly hunt down demons when they sense them. They find an old lady with a small girl with supernatural power. Tatsuki, as someone who is also a small child and has special powers, relates to the girl and tries to guide her to live happily among the people.

Suddenly they are attacked while talking, but are saved by another mysterious man. Tatsuki tries to get to know him, but finds out the reason that mysterious man has come is to seek revenge for someone he loved and that Tatsuki is the mans target.

Note: There is another story included at the back of the manga called Elnera. It is about a sea demon called Elnera and the love between a human boy and Elnera's daughter.

Yami wo Tsugumono

闇を継ぐもの

Yuki dreamed about a goddess along with 3 dragon gods. After that dream, she saw a dragon appears during the thunderous stormy night at her house. The next morning, she starts to notice that there is something wrong with her. She has a vision, and starts hearing people's thought. Soon enough her friend start acting strange and horrify incidents starts to occurs to her. 

Note: there is also 2 stories in the back of the manga. The first story is a spin-off for Maou no Kiza (魔王の刻) manga in the back of the manga. The 2nd story is called Dreamer Boy, which is about Taku and Yuki.  One day, they helped a boy and got a candy for a return. The candy wrapper has an instruction written there for Yuki and Taku to make a wish while eating candy and their wish will comes true. The next morning, Yuki found that Taku has became into a kid.

Seija no Mure

聖者の群れ

Two strange encounter with one unfamiliar name confused Rui. First she unconsciously blurted out when she saw a guy in her school, another time is when she heard a woman cries that unfamiliar name out just right when Rui saw the sword her father who is an archeologist shows it to her. With this sword Rui never know that it could transport her back to the old Japan where her father's troop is having a war with another. 

Note: Included in the back of this manga ,there is also an Omake which is a story about Tatsuki and Dule from Maou no Kiza (魔王の刻) This is a prequel story when Tatsuki is still a small kid that doesn't know about his power yet.

Hakuryuu Izayoi den

白龍十六夜伝

Miura, Kentarou

Studio Gaga

Guts, a former mercenary now known as the Black Swordsman, is out for revenge. After a tumultuous childhood, he finally finds someone he respects and believes he can trust, only to have everything fall apart when this person takes away everything important to Guts for the purpose of fulfilling his own desires. Now marked for death, Guts becomes condemned to a fate in which he is relentlessly pursued by demonic beings.

Setting out on a dreadful quest riddled with misfortune, Guts, armed with a massive sword and monstrous strength, will let nothing stop him, not even death itself, until he is finally able to take the head of the one who stripped him—and his loved one—of their humanity.

[Written by MAL Rewrite]

Included one-shot:
Volume 14: Berserk: The Prototype

Berserk

ベルセルク

Tanaka, Yoshiki

Katou, Naoyuki

Kamoshita, Yukihisa

In the far future, two young military leaders rise above their peers. The invincible genius Reinhard von Lohengramm is matched only by the unbeatable magician Yang Wen-li; though the two share a profound respect for each other, they meet on the battlefield not as comrades but as bitter adversaries. Commanding thousands of warships and millions of soldiers, they lead giant space fleets into battle on behalf of the two interstellar states that have wrested for control of the Milky Way for over a century and a half. 

The Galactic Empire, an absolute monarchy ruled by Kaiser Friedrich von Goldenbaum IV and an entrenched nobility, seeks to suppress the rebels daring to oppose the inviolable crown. The Free Planets Alliance, a representative democracy led by a corrupt High Council, degenerates as its elected leaders⁠ use war and conflict as a way to win popular support. Reinhard is a minor noble who became a High Admiral through his strategic brilliance and his sister's position as the favored concubine of the Kaiser, while Yang is an avid historian and reluctant commodore hailed as a hero despite only using his tactical prowess to navigate around his leaders' incompetence. On opposite sides of the galaxy, the two men have wildly different visions for the future: Reinhard dreams of uniting mankind under his iron fist, while Yang wants only to carve a path to lasting peace. As the war rages on, Reinhard and Yang each strive for their ideals and secure their place among the stars as the leaders of a new era of galactic heroes.

[Written by MAL Rewrite]

Ginga Eiyuu Densetsu

Legend of the Galactic Heroes

銀河英雄伝説

Iwaaki, Hitoshi

"Parasites" are tennis ball sized creatures, whose numbers and origins are unknown. They invade and take over the human mind in order to survive. Shinichi Izumi is a 16-year-old high school student who lives with his parents in a quiet neighborhood. One night, a Parasite invades Shinichi's body in an attempt to take control of it. However, it fails to complete the takeover process and ultimately ends up inhabiting only his right arm. 

Thus, both Shinichi and the Parasite—who calls himself Migi—retain their individual minds. Now in a peculiar "human and alien" relationship, Migi proposes that they cooperate to survive. Shinichi has no choice but to agree, and he must now cling to his morality as he and Migi face off against other bloodthirsty Parasites.

[Written by MAL Rewrite]

Kiseijuu

Parasyte

寄生獣

Hara, Tetsuo

Buronson

One day, a wanderer appears out of the wasteland to bring justice to the guilty and hope to the people—a warrior named Ken, a man who bears seven scars upon his chest and holds the secret of a mysterious martial art known as Hokuto Shinken, the Divine Fist of the North Star!

(Source: VIZ Media)

Hokuto no Ken

Fist of the North Star

北斗の拳

Saitou, Takao

Koike, Kazuo

For four decades, Golgo 13 has been the world's greatest assassin for hire - sometimes to settle a private score, and sometimes to change history!

His real name and nationality are unknown - but his legend is everywhere. G13 never fails a job, and never sees his clients again...

...unless they try and betray him!

12 Manga Like Tokeijikake no Ringo