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

Matsumoto, Leiji

Collection of short, humorous stories by Leiji Matsumoto.

Wadachi

ワダチ

Itou, Akihiro

Problems of the supernatural are menacing the city, and it's up to Kagura Security to stop them! Together, firey president Yuka, stylish Maki, computer expert Takami, brilliant mechanic Yui, and normal guy Youichi, are detectives, damage control, and more.

Geobreeders

ジオブリーダーズ

Shirow, Masamune

The main plot revolves around the Yamata Empire's plan to destroy all the galaxy's negative karma  using a massive technological reactor called the Nāga Generator. Unfortunately, negative karma cannot simply be destroyed, it must be atoned for. However the leader of the powerful mystic Buddhist Fuze Clan plans to stop the destruction of the negative karma which will end up creating the nine-headed Nāga and destroy the world if not the whole universe. To help in stopping the creation of the Nāga, the clan summons a Shinto god known as Susano, the Warrior God of Destruction. The powerful, arrogant, and homicidal god faces challenges. These include the Empire and the clan leader's own daughter, the bratty sorceress Seska, who is possessed by the power of the negative Karma and a powerful magic formula.

(Source: Wikipedia)

Senjutsu Choukoukaku Orion

Orion

仙術超攻殻 ORION

Kanzaka, Hajime

Yoshinaka, Shouko

Kane Blueriver and Canal, his AI companion, are trouble contractors who take jobs which require their special skills. This could go from armed escort, to patrol, to capturing dangerous criminals. Milly is a private eye who has to be the best at everything (uchuu ichi!!). When the three of them get together, they run into one mess after another, gradually uncovering more of a mystery that ties the legendary Lost Ships to all of their pasts, bringing them closer and closer to a discovery that something called Nightmare would rather not have them find...

(Source: MU)

Lost Universe

ロスト・ユニバース

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

Takaya, Yoshiki

Sho and his friend, Tetsuro, stumble upon a strange orb-like mechanism, the Guyver Unit, in the woods. It physically bonds with Sho and turns him into the alien soldier, Guyver. His mission is to protect the Guyver Unit from the Japanese corporation known as Chronos. They are after it and two other units just like it. To retrieve the object, they send out vicious monsters known as Zoanoids. So no one is safe in Sho's life; not even himself.

Kyoushoku Soukou Guyver

Bio-Booster Armor Guyver

強殖装甲ガイバー

Umezawa, Haruto

Hibino Hareluya is a delinquent teenager who is tough and loves to pack a punch. His father is none other than the almighty God who does not approve very well of his son's rebellious acts. Disappointed in Hareluya's lack of responsibility, his father sends him to Earth as a normal high school student, stripped of his powers. Posing as a local priest, God keeps an eye on his son's adventures as Haleluya rights wrongs around the school with two-fisted justice, Love tattooed across the knuckles of each hand.

(Source: ANN)

Hareluya II: Boy

HARELUYA II BØY

Yuuki, Masami

In the near future, large mecha called Labors are made to assist in various reconstruction projects in major countries around the world that are being threatened by global warming. In Japan, the government has enacted Project Babylon in order to conduct land reclamation. Labors are also being pressed into police and military service aside from civilian use.

However, terrorists are now attempting to use labors to make themselves heard, as well as common criminals, thugs and guerrillas. The National Police Agency established the Special Vehicles Division, an all-labor task force to combat the potential use of labors for criminal/terrorist activities.

(Source: MU)

Kidou Keisatsu Patlabor

Mobile Police Patlabor

機動警察パトレイバー

Watanabe, Michiaki

Pandora's Box led a cursed existence. Through the curiosity of a woman, evil was unleashed and very nearly covered the world in darkness. Miraculously, humanity managed to seal Maou Kestra back into the box, but only with immense sacrifices. Even without their lord, the demons are still a formidable force that has only grown stronger with time, locked in the abandoned capital of the North, Hameln. Fifteen years have passed since that fateful battle...

Meet Hamel, a travelling minstrel who is so self-centered that he'd sooner cook his guardian crow (and family friend), Oboe, than go hungry for even a minute. Welcome to the world of music and hilarious insanity that is the Violinist of Hameln. Watch as Hamel takes cheap shots at his opponents and bashes pigeons with his giant violin and turns them into dinner.

How WILL the world be saved from Maou Kestra with a hero such as this?

(Source: MU)

Hameln no Violin-hiki

ハーメルンのバイオリン弾き

Ishinomori, Shoutarou

Cyborg 009 is the story of a half-Japanese juvenile delinquent, Shimamura Joe AKA 'Cyborg 009.' 'Black Ghost,' a top-secret organization bent on promoting global warfare, kidnaps Joe along with eight other unwanted members of society from the four corners of the world and turns them into cyborgs. Though the organization intends to turn the group into super-powered killing machines, it's not long before Joe and his new companions rebel against Black Ghost and make their escape with the help of an old scientist.

Once Joe and friends have freed themselves, Black Ghost sends a series of other cyborgs and giant robots in hot pursuit. Using their new powers and abilities, our heroes stay one step ahead of Black Ghost and its evil machinations, but can they save the world from its diabolical scheme?

(Source: Tokyopop)

Manga Like Tenchi Mission