Quite possibly the best and most reknown fighter of all the schools is a red haired girl, solely referred to as the Red Lion. But as the Red Lion suddenly disappears one day, we find that's only the beginning to the trials of real "Red Lion".

From MangaHelpers:
Hana, a high-schooler that is known as the cutest girl in school, gets pulled into a supernatural event while on a beach trip with her friends. This event, called a "Red Night Eve" involves a transformed extremely massive shark, which targets Hana while she's swimming! Luckily, she's rescued by the siblings Yayako and Yuuto Kagimori, students from her school who know all about these occurrences, and who even have a support program AI named Acacia in their tablet to help them. Not long after, Hana and the siblings are involved in another event, this time involving her precious class pet parakeet being transformed into something monstrous. With all these supernatural events, Hana's life is never going to be the same.

The story of Red Prowling Devil centers on Naomi, a pilot who ends up working as an operative for a secretive world power as a way out of a life sentence for accidentally shooting down a plane full of civilians. Naomi feels deeply guilty about her crime and probably would have accepted imprisonment if it were not for an ill loved one depending on the money she earns from flying missions in her red-painted MiG-29.

Naomi's assignments take her to locales around the globe, and the ace MiG pilot becomes world-famous (or infamous) as the "Red Prowling Devil," targeted by rival pilots from world air forces and terrorist organizations.

From: Easy Going Scans

When the Raven starts to sing, people die... An unstable world, a weak government... and Mafia's escaping from their sins... In order to reduce unpunished crimes committed by the mafia... A Strength was born... Its agents are merciless and they kill without hesitation. The Last Enforcement Organization known as Red Raven.

Around the 17th century, Wu San Gui overthrown the Mu Wang Palace with the help of a mysterious person, allowing them to do whatever they please to in Yun Nan, the Mu Wang Palace who had hidden in seclusion was massacred, and a simple youth named Jing Xiu Ming became the only survivor after being saved by the disciple of the Yunyou divine doctor named Ling Le Sui, but was infected with an illness that causes people to go berserk. In order to find the killer who killed his entire village and cure his illness, Jing Xiu Ming and Yunyou divine doctor's disciple set off for a journey.

Technology has advanced due to the discovery of an alternative source of fuel called "Thunder-Cores." This has changed civilization for the better due to the creation of longer lasting trains and cars, and a new form of transportation called Air-Ships!

The story follows Tatsu Frampt, a young boy who lives in an orphanage nowhere near the city, who dreams that one day he will be the captain of his own air-ship and travel around the world alongside his friends. He is told that he and his friends are being isolated from civilization due to a disease that makes iron grow in their bodies. However, the orphanage is attacked, and Tatsu is the sole survivor, and learns the dark truth of his "disease." Six years later, he embarks on a mission to save his friends, and kill those who stand in his way...

A mysterious man suddenly appears in the desert separating the East and West Continents. A young boy, Yulian Provoke from the Pareia tribe finds this man, and brings him to his village. Turns out the man is an incredibly strong and amazing individual, and he begins to teach the young boy fighting skills.

From Easy Going Scans:
The story of a boy and girl whose lives were one day entwined by red string. Literally.

Iouri is the successor to Abalkin, a luxury brand of dazzlingly high heels. He spends his days parading in Abalkin heels to promote the brand, and the nights servicing patrons for the company's survival and growth. Through the years, he's had his secretary Adam by his side, but their relationship isn't as simple as it seems...

A dark, twisted, psychological story in true Ogawa Chise style!

A trans-dimensional fantasy.

A young boy's curiosity leads him to attempt an urban myth which sends him to a dimension called 'The White World'. There he meets a young man who sends him to a world called 'Devildom', he ends up landing in water in a kingdom called 'Kyungma' and nearly drowns until he is saved by a mysterious young girl who seems to control water...

N/A

Da-ae’s past and present is filled with dirty little secrets. It was about time someone noticed. The only problem is Gitae, the minister’s son, is not your ordinary someone. He gathers all the people that suffered from Da-ae’s dirty acts and starts the road to her redemption.

Winner of LEZHIN's 1st BIG 4 Comic Contest

A girl finds her friend has been possessed by the ancient spirit of an American Indian warrior, who has been involved in the deaths of numerous presidents.

From MangaCity: Redrum 327, a manhwa by Ko Ya Sung, plunges readers into a world that's a cross between the "Scream" franchise and Stephen King's "The Shining." It tells the tale of a group of friends who plan an impromptu visit to an isolated chalet in the mountains. Their weekend getaway starts out as a pleasant idyll, but as the evening progresses, tensions rise, rifts form and conflicts occur. Soon they start to experience strange disappearances and hallucinations, and that's when their trip turns into a real nightmare.

Three students find out they all share the same name--Hiiro Takumi. They quickly become friends and make up nick-names for one another. One boy will go by Takumi and the other will go by Hiiro. The girl is called Mametaku, meaning “Small Takumi.” A strong bond is formed between the three, but what happens when the two boys both start to have stronger feelings for Mametaku? Who will she choose, and will their friendship survive?!

Irene Perreira is a boy who sleeps to run away from reality. People mocked him, calling him a 'deadbeat', but he had no wish to change. Until one day, he dreamt of a swordsman… It was a dream about a talentless man who had been training by swinging his sword for decades.

For Park Ki-Yoong, someone who’s reached the peak of his sex drive, having an orgasm was the best joy of his life. After serving his compulsory military service, for two years, he is now about to be discharged from his duty, and into the civilian world. As the saying goes, patience will persevere, Park Ki-Yoong desperately aims to enjoy the free night with the girl he loves, whom awaits outside ut, what’s this dream? Whenever he has an orgasm, the time rewinds. Will he ever be able to shift himself away from the time rift?

Se-da is an innocent girl who has never loved anyone because of her strict father. Jee-Moon likes Se-da but Se-da doesn't notice it and actually is in love with someone else. With Se-da, War of Love takes place between two charming guys.

Lidia is a young empress with a pendant that has a counterpart out there somewhere – which is carried by a young thief tamed Keitsu who runs with wolves. The thief and the empress become friends fairly quickly as they figure out the significance of their respective pendants, but they don’t realize that the entire world is about the be changed by them…