Outer space, the far future.

A lone seed ship, the Sidonia, plies the void, ten centuries since the obliteration of the solar system. The massive, nearly indestructible, yet barely sentient alien life forms that destroyed humanity’s home world continue to pose an existential threat.

Nagate Tanikaze has only known life in the vessel’s bowels deep below the sparkling strata where humans have achieved photosynthesis and new genders. Not long after he emerges from the Underground, however, the youth is bequeathed a treasured legacy by the spaceship’s coolheaded female captain.

Note: Won the Kodansha Manga Award for general manga in 2015. Won the Seiun Award for Best Comic in 2016.

A sitcom about an ordinary man and his alien wife.

One day while walking home from school, he finds that someone has messed with his trash. His trash has been left behind because the different types of trash were mixed up. The perpetrator kept mixing up only Souya trash everyday, so one day Souya decides to lie and wait to catch this annoying criminal. That day, he finds that the perpetrator was actually the recently transferred classmate, Tokisaka Koyomi, and she reveals that she has come from the future to stop all environmentally friendly activity. Now, Souya and Tokisaka will have to live together and destroy the environment so that Tokisaka can go back to the future. [DrCoke]

Kaitai is a science-fiction-ish BL story of bio-engineered humans, sinister policemen and moody scientists with mysterious pasts.

Set in a depressing, fictitious London from somewhere in the near future, this manga is representative of Ishihara's earlier, non-yaoi works; rough, sketchy artwork accompanied by an interesting plot the likes of which is rarely seen in the shounen-ai demographic.

From Tokyopop: Unfulfilled love always ends tragically… or does it? Through different seasons and different eras in time, two lovers cross paths again and again, trying for that one chance to get it right. Different lives, at different points in history, but one thing remains constant—their love for each other. Spanning the beginning of history, WWII-era Japan, modern-day America, and the far distant future, these love stories remind us that love truly has no boundaries.

The year is 2061, when space travel is now possible and commercially viable, and the students of Caird High School embark on their Planet Camp.
But soon after Group B5 arrived at their planetary camp site, a mysterious and unforeseen sentient light sphere warps its 9 members into outer space, stranding them 5012 light years away from their home planet.
With the discovery of an old, unmanned spaceship nearby, the students must stay strong, manage their limited resources and remain united in the darkness of space, so that all of them can survive their long and likely perilous trek back home aboard the Astra.

Long ago, the Emperor possessed great mystical powers... and now, a young boy wonders: will he have them as well. With no memories, and only a rose-shaped scar on his forehead as a clue, he ponders his legacy while on the run with the girl who rescued him from a group of armed warriors. She takes him to a scientist who seems sure Rose is the Emperor's clone, and that this young boy must assume the mantle of leadership. But opposing forces have created another clone from the Emperor's DNA... and the struggle for power begins.

from Wikipedia: Justy Kaizard, a police officer who chases down criminal espers; his tactics might be similar to those of a bounty hunter but he is a salary-drawing officer.

From NetComics:
Commonly acknowledged as a genius biologist, Dr. Gangjae Lee has a conceited and blunt personality that tends to push people away. But that doesn't bother him since he is a happy husband who has been married for 7 years to Jaehee, a woman whose astonishing beauty and sexiness captivates men.

While living a double life as a college research professor, Dr. Lee secretly participates in a human cloning project run by Dr. Suh. Through numerous trials and errors, and thousands of experiments, a few clones are born. But these miracles of science are sub-quality clones whose life spans don't stretch much past 7 years.

Although their methods improve, the two doctors give birth to another sub-quality clone, but this one is of Dr. Lee's wife, Jaehee. They call her by three different names: Jaehee, Clone S04, and a name her lover and popular novelist Jinhun gives her, June. Together with Dr. Suh and Jungwoo, and hidden from the eyes of the world with the support of underground financial powers, Dr. Lee devotes himself to this project.

But one day, his wife who he treasures more than his own life, gets brutally murdered and the story takes a different turn...

English Publication

In an alternative world where science and a sprinkle of magic reside together, there exists 'Number 9', a robotic servant for a young lord with an interest in machinery. One day, she visits a magical shoe shop asking for a pair of shoes that can "stop dreams". What could this possibly mean, and how will her relationship with her master end? Devilish Holly: It is a very cute story, well written out. But it feels like it could continue whenever the author wants it to. It is a really good story and I recommened to everyone! ^^

From MangaArt: There are 2 manga series in the book. In the first series, Magic, the background is set in the futuristic 2200's in the edge of the galaxy. Super model Kana has died in a space ship accident when she traveled to a planet on the edge of the galaxy. Her daughter was found 3 years after the magnetic storm has rested. A distant related cousin of Kana adopted the young child (he was also an old boyfriend of Kana!). Years later, Kana's child has grown up to be a teenage girl... In the second story, Silence, the background is set in modern Japan. A teenage boy is seeking revenge for his brother who was murdered by gangsters. He rides on his bicycle, approaches each of his enemy and then pulls out his pistol! No one is supposed to find out. But someone notices him...

From Tokyopop:

After a near-fatal car accident, surgeons rebuilt Reiji with prosthetic parts and renamed him Himejima Kazemichi. It was a second chance at life... but there was no guarantee that his new body would last. As his artificial heart runs down, Kazemichi embarks on a journey to discover what his life really means, and live -- and love -- to the fullest. Along the way, he uncovers dark secrets about his past... including the organization that was responsible for resurrecting him...

From CMX:

MADARA tells the story of an apprentice blacksmith in a rural village who gets by using artificial limbs created by his adoptive father. But when a chance encounter with the demon Moki reveals Madara's true destiny, he's catapulted into a mythic quest! His real father, the evil despot Miroku, feared long ago that Madara was destined to kill him and rule in his place. After Madara was born with tremendous powers, his body was cut up, and the parts divided amongst eight evil generals. Now Madara, with the help of a band of freedom fighters and a magical sword, sets out to retrieve his body parts and defeat his brothers, who covet the throne. As he fights his way across the world, he contemplates the prophecy: How will he wrest control of the kingdom from his father and win the people their freedom?

MONSTER MACHINES THAT STALK THE EARTH, Van is the son of the greatest Zoid pilot in town, but he isn't living up to his father's reputation. He's lucky if he can even get a Zoid to move, but while being chased by a rampaging scorpion-like Zoid, Van finds himself in some old ruins.

Iro’s plan was simple. Pretend to be a service man, make the delivery, and exchange a few words with Rene, his dream guy. But when a drunk Rene mistakes him for the android he ordered, Iro decides to take advantage of the situation. As long as he keeps playing along, he gets to live with the man of his dreams! But what will happen when Rene finds out the truth?

Takemoto Takeru, an ordinary high school student, encounters a strange light during a bike delivery for his part time job.

When he stops and searches the surroundings, he notices a cute girl named Hikari climbing out of a sparkling cocoon in the forest.

Takeru instantly falls for her at first sight, but was interrupted when suddenly a monster appears at the same spot and attacks the girl.

This is the beginning of adventurous and exciting days for Takeru, the mysterious girls, Hikari and Akari, his childhood friend Nishino, Mari, and his classmates.

In a world where humans co-exist with Juujin (literally: "beastmen"), genetically mutated animals that have remarkably human-like features with the exceptions of extremities such as tails and ears, Juujin are often found as laborers in the work force or raised in households as pets. That is until a new kind of Juujin appears-- Evolutions, EVOs for short. These Juujin have special magic-like powers that they are using against the human race.
Peke, one such EVO, has been raised with her master Yamato Yamamoto. Yamato's mother works for the Health Care Center-- the only agency with jurisdiction over the Juujin, and has developed a special collar that can seal the EVOs' powers. Having used this collar to control Peke's own powers from going berserk, Peke must now release this power to fight and capture the rampaging EVOs to save humanity and to win her master's love.