From Stiletto Heels:

Dependant on her boyfriend of seven years, unable to communicate well with others, and lacking self-confidence, Miki feels like a bird trapped in a gilded cage. In the midst of all this she meets a callous young man named Kamaya at her post in the students affairs office. Although Kamaya seems to have no qualms about invading her personal space, he saves her when she's in trouble, and Miki gradually begins to see him in a new light.

A cat familiar goes looking for a kawaii mahou shoujo to save the world, but the chosen one is a rather special girl.

Bi-Kwang is a handsome young warrior who becomes a drooling mess whenever he sees a pretty girl. Out on the road he meets an extraordinary swordfighter with no name who is searching for a legendary master warrior. Bi-Kwang promises to aid the swordfighter if he lets Bi-Kwang meet his beautiful sister. Of course, it turns out the swordfighter is the sister, Hwa-Rin Dahm, and she must switch identities to keep the plot moving along. Bi-Kwang is immediately smitten, and thus we have a triangle involving only two people.

This manhwa was made into a MMORPG.

Kanami, a young man that strayed into another world and suddenly awoke in a dark corridor is nearly killed by a demon and humans. Then preferring to use the status and skill systems Kanami aims for the deepest part of the Labyrinth. The skill [? ? ?] consumes his emotions, and he befriends some unusual people, but while his spirit wanes in the other world’s Labyrinth he refuses to give up on returning to his original world.

“I'll absolutely save you. Hence I will–!!” Aikawa Kanami awakes in a corridor he has no recollection of, the wound he received from a goblin is cured by a pretty girl called Lastiara, and he learns that he's in a different world that's exceedingly similar to a game. Kanami makes into his weapon the hearty welcomed status and skills, and with a pretty girl Dia plunges forward towards the deepest part of the labyrinth that's rumoured to “grant any wish”–. This is a story of a boy who exposes the deepest part (truth) of the labyrinth and fulfills a wish.

Based on the early Japanese folktale Taketori Monogatari, this is a story about a Princess exiled from the moon and her story on Earth. On the dark side of the moon exists a highly advanced civilization divided into two clans, the Takenouchi family and the Umenouchi family. Takenouchi Kaguya is the daughter of Takenouchi Fumiya, the acting queen of the clan. Kaguya is the next in line for the position for queen but she refuses to be obedient and wants to enjoy life. The bratty Kaguya despises her mother and the people around her for being so strict and often wishes she was never born as a princess. Queen Fumiya has been severely ill for many years now, but has kept it from her daughter in order to protect her but her condition has worsened. The Umenouchi family takes this opportunity to start a coup and takes over the government. Knowing that she is not able to ensure her daughter’s safety on the moon, Fumiya sends Kaguya to Earth with the powerful katana that symbolizes her ownership of the moon. Without the sword, the Umenouchi family cannot usurp control of the moon. Kaguya is forced to mature and become stronger in order to take back what was once her mother’s!

“Hey, hurry up and massacre those bandits!”

“No way, I don’t want to work…”

Spending my daily life in leisure, that was my pastime—until I was summoned into another world and met a blonde loli introducing herself as Dungeon Core No. 695.

“Save my dungeon. By the way, if the dungeon core is destroyed, you’ll also go down with me as the dungeon master.”

A dungeon with a single room. Moreover, one already controlled by bandits. This is a [Checkmate] no matter how you look at it. Guess there’s nothing to do but somehow get out of this situation so that I can [Not Work]!!

Charlotte, who reincarnated as a villain girl in a maiden game, started to avoid the death flag. The goal is to spread the sake that I loved in this world! However, the juice and holy water that I made for trial were all nonstandard ...

A different world, "Sake" fantasy, opened by a cheat girl!

The Kafkaesque autobiography of a diplomat who compares himself to Grigori Rasputin, and what happens after he gets caught up in a political purge during the early 2000s.

A legal thriller with a dash of geopolitics.

While the demons were rising, mankind was about to become extinct. Six temples rose, and protected the last of mankind. A young boy joins the temple as a knight to save his mother. During his journey of wonders and mischief in the world of temples and demons, will he be able to ascend to become the strongest knight and inherit the throne?

From MangaHelpers:

Katagiri Yuichi believes that friends are more important than money, but he also knows the hardships of not having enough funds. He works hard to save up in order to go on the high school trip, because he has promised his four best friends that they will all go together. However, after the class's money is all collected, it is stolen! Suspicion falls on two of Yuichi's friends, Sawaragi Shiho and Shibe Makoto.

Soon afterward, the five of them are kidnapped, and wake up in a strange room with a character from a short-lived anime. Apparently, one of them has entered them into a "friendship game" in order to take care of their massive debt. But who was it, and why did they have such a debt? Could they have stolen the money from class to pay for entry into the game? Katagiri and his best friends will have to succeed in psychological games that will test or destroy their faith in one another.

In the year 1947, the people of Shinjuku are down on their luck. With little money to buy food or necessities, some resort to gambling in order to survive. Traveling Tetsuya chooses to spend his time at Mahjong parlors where he is wiping the floor clean with his adversaries. However, Tetsuya meets the intensely-skilled Boushu-san, this is when he realizes that his skills are still lacking.

Note: Won the 2000 Kodansha Manga Award for shounen.

Kang Pildu, a cold-blooded psychopathic prosecutor, receives the news of his mother's death. He finds out that the "Seonhwa Group" led by his father and older brothers was involved in her death. Thus begins his desperate revenge plot to bring down the Seonhwa Group.

Follows the story of “Edo's Sanni-en (Sajin no)” Takasaka Jinouchi, Jozawa Junai, Shoji Jinouchi. Three years after the battle of Sekigahara (1603 AD), Okubo Changan invited Takasaka Junouchi, who is known as a former thief, to participate in the battle, but what will he get in return?

The return of the famous teen detective, Kindaichi Hajime. With his keen intellect and sharp wits, there is no case he cannot solve, in the name of his grandfather!

Shirokawa Sasane (30) is a former trading company employee and a huge fan of Romance of the Three Kingdoms. One day, after losing consciousness in Chinatown, he wakes up to find himself in the form of a little girl. However, the new body he finds himself in isn't just any little girl, but the granddaughter of the infamous tyrannical Dong Zhuo, Dong Bai. In order to avoid the fate of being executed alongside Dong Zhuo, Dong Bai will have to use both experience as a Japanese businessman as well as knowledge of the era!

With tensions between the neighboring country rising signaling the presence of a war soon to begin, Soalla, the princess of a small country, worried whether her own country would be able to defend itself with its weak national power. The king was bedridden and the retainers who were her last rays of hope had nothing but the antiquated motto of battle honor in mind. Not one person had a concrete proposal to protect the country, leaving Soalla to wonder if this was where Favell would fall... However, it was then that Naoki appeared before her. A "magician," that left his name in history who possessed the power she desired to save the country.

Ide Nobuhisa has always been a boy full of vitality and a young promise in the field of track running. However one day after a competition, he stumbled over the pretiest pair of legs he had ever seen! Their owner, a young girl practicing tennis makes a promise with Ide that she will teach him how to play. After seeing the name tag on her racket bag, Ide puts all his efforts into passing the test for accessing the same high school she goes to, Makunogama. In his first days in his new high school, Ide discovers two things: an old friend of his is also attending, and nobody knows of a girl with the name he saw on the tag! He and his friend join the school tennis club, where they meet another first year, Takita Louis (Ruui), a very good tennis player with a little of an attitude problem. However things start to look better for Ide when his dear missing girl appears in the school! As it happens, he misread her name on the tag...

Suddenly one day--energetic high school girl, Katagiri Hina, has time slipped into the year 1907. The first person she sees is the sorrowful man by the name of Hongo Takaaki. Who exactly is this Hongo-sama? As fate works its gears, how would their romance unfold?
Transcending time, two people meet. A destiny.

Year 20XX, strange phenomena started to occur all around Japan. The best way to explain it would be a ''hole'' that connects different worlds to our world. Many otherworldly beings - magicians, demons, robots and other fantasy creatures started to appear on this side, with no way to return. With the time passing, Japan was able to adapt to this event and visitors from another world stopped to be anything unusual.
And so, an unlucky witch named Henrietta was pulled through the ''hole'' and ended in modern day Japan without a way to return. How will she be able to live in this different world?

I entered my favorite romantic fantasy novel! I may be a commoner, but I'm rich beyond belief. I quietly watched the romance of the main characters in the original novel, assuming I would go back to reality after reaching the novel's ending... However, even after the ending, I am still stuck in this world! As a result, I learned the behind-the-scenes stories that I didn't want to know. My favorite second male lead, Kaelus, died. Living in poverty without him, I eventually became ill and died as well. I thought I would return to reality, but I went back in time instead. This is definitely... This means I have to save my beloved, right?

Notes: The novel of this series was originally released as R15, 7 months after being completed the book/ebook was later re-released as R19. The webtoon will follow how the novel was originally released which is R15.