Conspiracy, betrayal, and war that revolves around the Chess Isle Crest! Amidst these events, one man's sleeping resentment and grudge starts to become conscious and real. Webtoon from Naver Please address this work as a Manhwa (Korean word for cartoons)

The son of the Qin emperor is in danger. The soldiers have cornered him and things look pretty bad for him. Just when he was about to lose hope, a stranger with golden hair appears and saves him and his mother. Follow their adventures as they try to stay alive and unite the land under one ruler!

Older cousin returns after six years to find his younger cousin has grown up really pretty.

From Scum-Scans:

Chocolat is a mature comedy series about half-orphan Tatsumi Chiyoko whose father was caught in huge debt. Now living with Omugi Matsukichi, an ex-underground king who opened a pastry shop, she gets to know people like Katou Ichigo, an ex-inmate. With people after her father's whereabouts, what will happen to her?

In a not-too-distant future, the Earth has been overrun by a horrifying technovirus. Mechanical parasites, mistakenly created in an attempt to advance technology, attach themselves to human spinal cords and turn their hosts into cyborgs.

Desperate to rid themselves of this technological terror, the remaining human survivors must band together and learn to defend themselves against their android enemies.

From Dark Horse: In a time of chaos and war, a godforsaken era, twin sons are born to an emperor. But legend states that the son of the emperor shall be born a demon! But twins? Who is the demon, and who shall reign as emperor? Chunchu is the story of a young man saved from death by his mother, banished by his people, hunted by his brother, and tortured by the demons within. Living and fighting with a low-born warrior tribe who can never trust him, Chunchu lives a life of blood and violence, every day a struggle to survive. But something mysterious lurks within his cold exterior, something that could be awakened by the touch of a woman. * Manhwa of the Year in Korea-2003.

Akabane accidentally discovers that his classmate Sumomo is one of the Japafive Rangers. He is then recruited as one of the Japafive Rangers but things don't go very smoothly.

It's not serious, feels more like a gag parody more than anything else

A series of yuri one-shots.

The first is about two childhood friends who like music and who are asked to perform at the graduation ceremony of their school.

Longing deals with two members of the archery club: Kyoko and her senpai Touko, who is ashamed of her man-like body.

Spice is about a young girls-loving teacher who wants to seduce her female students.

Innocent is about a nude portrait hanging in an art room, the model and the painter.

Rendez-vous is about two girls secretly in love who plan to elope together after being found out.

COMPILER is a story about the Igarashi brothers Nachi and Toshi, and two beauties from another dimension, Compiler and Assembler. Originally sent to conquer Earth through a game of destruction and creation, Compiler and Assembler ended up deciding that living in our world is more fun than conquering it. They moved in with Nachi and Toshi. A growing relationship began to develop between Nachi and Compiler, and Toshi and Assembler, though none of them can bring themselves to admit it outright.
Meanwhile, the people who sent Compiler and Assembler to conquer Earth were outraged by their apparent betrayal. They sent two assassins, Bios and Directory, to deal with the renegades and proceed with the invasion plan. And so, the misadventures begin...

Tsurebito is about the people who escort you from purgatory into the world of the dead. After you die you must go through your personal gate into the world of the dead, and escorts are the ones who lead you there.

A beautiful love story between a boy and a girl, that takes place in Hokkaido.

From Dark Horse:
Two slaves free themselves from a slave ship; one a Japanese man, the other an African American.
After escaping, they find themselves on the shore of Edo-era Japan, a society with a strong caste system, isolated from the world. How will the Japanese people perceive this giant black man, and how will they survive? But first things first: How will they get these shackles off their feet?

Some random gag stories happening around a woman living inside the washer in the coin laundry. Why does she like to live there?

Yuma Saihashi is a miko who lives at the shrine. She is a lone wolf who distances herself from others and refrains from making friends. During her free time, she gives massages to the elders in the neighborhood but refuses their gifts. Like her friend Chinami, she can emit electromagnetic waves. Her power is not as strong as Chinami's but she can control it better.

Spin-off of the CODE-E Anime.

From Entropy:

In the languid hours of yesterday, I went to the tangled grasses near the river, so tangled that humans don’t often venture there, and had heaps of fun playing alone. As per usual, I had had a glass of sue-ju with grandmother in the morning, and drunk, I grabbed a towel and stumbled my way up. There won’t be any watchers, my body thought, and it slipped so easily into the water. Floating in the clear and pretty water I looked at the sky, saw the floating clouds. Hee hee… in that small space I even had a go at swimming like the pros. If you sit on the rock and rest for a bit you can see the small sand-colored fishes swimming around. Even such small creatures made shadows on the river bed and moved around. Yeah, every day I play at being a mountain wizard. Whether the axe handles decay or not… violets.

It happened after school one rainy day... A group of friends have stayed behind to prepare for the next day’s school festival. One moment they are idly telling ghost stories but the next an enormous earthquake strikes and the entire school seems to fall down around them. They awake to find themselves trapped in a parallel version of their school. A school abandoned and disheveled and whose calendar dates back to 1927. Can they find a way out of this nightmare or are they doomed to the same fate that befell the other victims whose corpses that lie numerous throughout the school?

From Kotonoha:

Seventh grader Hayashi Renei is troubled by a strange dream: Her dead brother, who was killed in an automobile accident, comes back to life as Coo. The dream comes again the following night and then every night thereafter.

Coo's world is a cruel one--crueler than the real world, even--with its own share of pain, suffering, and sadness. Renei is searching for her house with her brother and others whom she meets in Coo's world so that she can return to reality and the land of the living...

Taking place approximately 50 years after the original D.C. - Da Capo series, the story revolves around Sakurai Yoshiyuki and Otome & Yume, the two granddaughters of the original D.C. - Da Capo protagonists Junichi and Nemu.

This is actually the second manga based on Da Capo II in active serialization. The other manga, running in Kadokawa’s Comptiq magazine, is considered to be the “canon” adaptation of the story (i.e. it’s based directly on the game). As the title “Imaginary Future” suggests, this manga proposes an alternate deviation from the game’s premise, where fan-favourite Shirakawa Nanaka (speculated to be a descendant of the famous Shirakawa Kotori) is the story’s main heroine.

From Anime Waves:
Tsukasa, Tajima, Katsu, and newcomer Sae, were all members of the Hentai ShonenDai (Perverted Boy's club) at the tender age of 11. But as they grow older, how will each of their lives change? Will they grow apart, or stay true to the (perverted) passions they shared as kids. D-ASH is a story about the adventures these boys will have trying to grow up as fast as they can, being as naughty as possible all the while.

Kasuga Rito had a hidden wish for a very long time: to use his ability for good and to help people. But before he could do that, he needed to gain the power of magic first.

Rito is a sophomore in Rezon Institute, a school for people with special magic abilities to find, train, and develop their skills. Each student has to reach 100 points to be able to start using their ability. Otherwise they won't move up from the "Common" and into the "Starlight" class. But Rito, known as "the Eternal 99", has been stuck with an unchanging 99 points for a long time.

So here comes his new plan: to become a friend with Scuse Fontana, a three-day exchange student from the Demon World, and to ask her for some food. (There's rumor that a human can increase his power by eating food from the Demon World). He slipped into the hotel where a welcome party is being held for the much respected lady, just to find that she's actually absent. Losing hope, he wastes no time leaving the hotel. At the back alley behind the hotel, he finds a tiny dragon, which for some reason sticks to his head and now he can't get it off...