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

Tezuka, Osamu

Short stories collection of a variety of more mature Tezuka works.

1. Shokei wa 3-ji ni Owatta (The Execution Ended At Three)
2. Seijo Kainin (Immaculation Conception)
3. Tokeijikake no Ringo (Clockwork Apple)
4. Bypass no Yoru (Night On The Bypass)
5. Fukuro (Pouch)
6. Yellow Dust
7. Akuma no Kaimaku (Curtains)
8. Kikansha (Return Ship)

Tokeijikake no Ringo

Clockwork Apple

時計仕掛けのりんご

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

Kamiya, Yuu

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

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!

Golgo 13

ゴルゴ13

Matsumoto, Leiji

In the future, humanity has achieved a vast starfaring civilization, but is slowly and steadily succumbing to ennui or despair, often due to defeat and subjugation by a foreign invader. Rising against the general apathy, Herlock denies defeat and leads an outlaw crew aboard his starship Arcadia to undertake daring raids against Earth's oppressors. Their primary oppressors are the Mazone, a race of organic plant-based alien women who explored Earth in the mythic past and are now back to reclaim it.

(Source: Wikipedia)

Uchuu Kaizoku Captain Herlock

Captain Harlock

宇宙海賊キャプテンハーロック

Otomo, Katsuhiro

Nagayasu, Takumi

Orbiting serenely above a long-ago poisoned earth, the last bastion of human civilization is the space colonies. After a terrorist attack, the colonists are forced into exile on the blighted planet below. In the confusion, a young mother is separated from her family and is flung into a bleak, uncertain future... But Sarah will not rest until she finds her children.

(Source: ANN)

Sarah: The Legend of Mother Sarah

The Legend of Mother Sarah

沙流羅 -The Legend of Mother Sarah-

Monkey Punch

International man of mystery and master thief extraordinaire, Lupin III comes from a long line of high stakes bandits, all committed to stealing from the rich and giving to themselves. Fortunately, Lupin tends to avoid robbing society's virtuous and, instead, targets some pretty shady characters.

Of course, he partners with some pretty shady characters as well: Daisuke Jigen is an ex-mafia hitman who carries himself with a somber demeanor, his trademark black fedora tilted forward to hide his eyes. Goemon Ishikawa is a cipher-like swordsman with samurai-ish overtones who mysteriously fades in and out of Lupin's exploits. Fujiko Mine is the object of Lupin's affections, but, since she is a thief herself, the duo's romance more than occasionally clashes with their competition for big scores.

The global police force, Interpol, and in particular the tenacious Inspector Zenigata, long to capture Lupin and his gang. Zenigata's relationship with the eponymous master thief is a complicated one, characterized by mutual respect laced with utter disdain. The two have even worked together when it's served both their interests, but they understand that when the crisis ends, they must resume their former wariness and animosity toward each other.

(Source: Tokyopop)

Lupin III

Lupin the 3rd

ルパン三世

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

Ogino, Makoto

A young mystic without a past, Kujaku was born under a dark omen possessed of incredible supernatural powers. Raised by priests, he has learned to use these powers for good. But the evil Siegfried von Mittgard seeks to steal his birthright, and rule the world as the Regent of Darkness. He has dispatched bloodthirsty minions to destroy Kujaku before he can awaken to his destiny. Now, Kujaku must unravel the riddle of his past, before the power within consumes him!

(Source: AniDB)

Kujakuou

Peacock King

孔雀王

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

Deep Insanity: Nirvana

12 Manga Like Deep Insanity: Nirvana