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

Manabe, Jouji

It`s face-to-face confrontation when Kahm stares down her father and refuses to end her relationship with Tetsuya. In retaliation, her father sends a punitive fleet to Earth -- with orders not only to crush the rebellion but to annihilate the entire solar system!

(Source: Amazon)

Outlanders

アウトランダーズ

Minagawa, Ryouji

Takashige, Hiroshi

An ancient alien civilization once hid artifacts of immense power across the Earth, and now the world's governments will stop at nothing to seize those relics for their own nefarious purposes. Only the ARCAM corporation stands against them, whose special agents, the Spriggan, are the world's last line of defense against the alien doomsday weapons. Equipped with experimental armor that grants him unmatched strength, Yuu Ominae is Spriggans' ace operator, sent to avert catastrophes around the world.

(Source: Seven Seas Entertainment)

Spriggan

SPRIGGAN

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

Akiyama, George

Nine children are bestowed the almighty power of the monstrous robot, The Moon. By focusing their thoughts together they become able to control it with their minds and save the world from annihilation.

The Moon

ザ・ムーン

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

Sakai, Takayuki

Time-travellers from the 22nd century return to present day Japan to warn the world that Godzilla will soon return, and his rampage will be so great that the country will never recover. With the help of a non-fiction writer who has accurately guessed the true origin of Godzilla, the people of the future offer to return to the past and prevent Godzilla's birth. However, upon returning to the present they find that Godzilla has been replaced by an even greater threat; The three-headed demon King Ghidorah! How can the world survive without the King Of The Monsters to face this new terror?

Godzilla vs. King Ghidorah

ゴジラvsキングギドラ

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

Oze, Akira

Yajima, Masao

After having vivid daydreams of a barren and far off world, a teenage delinquent finds himself transported to this world after a near fatal accident.

Ryuu

リュウ

Chobin is a funny creature that falls on the ground after the capture of his home planet by the tyrannical forces of Brunga, a demonic figure in a dark coat with bat-like wings.

(Source: MU)

Hoshi no ko Chobin

星の子チョビン

Kuroiwa, Yoshihiro

Iizuka, Yukihiro

Raimon Ryuuta and Kuuko are sibling. Their parent is a treasure hunter, so since they were little they lives in a shrine with their parent's best friend who is an old man.  

Ryuuta and Kuuko are interested in anything strange, curious issues. Together they set up their business as a Fushigi Hunter, to solve cases of strange paranormal activity people asking them for help.

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