There's a great war between Rohaman and Tiroko. The queen of Rohaman unseals an ancient weapon with which they have a chance of winning the war. However, the weapon is incomplete and so they can only use a part of its powers.

One day, while being attacked, a young knight saves the queen from a powerful enemy. Seeing his skill and powers to be far greater than the average knight, she sends the soldier off with two companions in search for the missing pieces of power needed to make the ancient weapon whole.

A friendly, good-natured mailman traverses the rural areas of Korea on his red bicycle, dealing out letters and interacting with the letter-writers and recipients along the way.

The more you think about it, the scarier it gets. This is about things that are everywhere and nowhere.

A Yurimm Fairy Tale.

"The Red Hook is a super-thief who is bequeathed the omni-fist of altruism and transformed into a hero against his will a year after a sentient Brooklyn's heart is broken and physically secedes from America."

The Red Love Letter tells the story of a woman's affair with her sister-in-law.

In the final battle against the evil Exterminators, Asagaki Tougo, a power ranger, traded his life for the enemy's. It seemed like everything was over, but suddenly he found himself in another world! He becomes an adventurer, transforming into Kizuna Red, and continues fighting to save people in trouble! Here he meets a young Wizard named Idola and his journey in this new world begins!

Beware the red snake! Told from the perspective of a young boy, The Red Snake is a story of the above boy, the house he inhabits, and the forest around his house that stretches on and on. The characters in the story are all mad: his grandfather, who sports a massive growth on his jaw; his grandmother, who believes she is a chicken; his father, who is vicious to the chickens he raises (except for his mother, to whom he provides eggs that so that she can claim she laid them herself); and his sister, whose affection for insects borders on the erotic. The story evolves into a classic nightmare.

The Hino Horror series:
Hino Horror Volume 1: The Red Snake (赤い蛇 Akai Hebi)
Hino Horror Volume 2: The Bug Boy (毒虫小僧 Dokumushi Kozou)
Hino Horror Volume 3: Oninbo and the Bugs from Hell (地獄虫を食う! 鬼んぼ Jigoku Mushi Woku! Oninbo)
Hino Horror Volume 4: Oninbo and the Bugs from Hell 2
Hino Horror Volume 5: The Living Corpse (死肉の男 Shiniku no Otoko)
Hino Horror Volume 6: Black Cat (黒猫の眼が闇に Kuroneko no Me ga Yami ni)
Hino Horror Volume 7: The Collection (M Collection)
Hino Horror Volume 8: The Collection 2
Hino Horror Volume 9: Ghost School (Ghost School (HINO Hideshi))
Hino Horror Volume 10: Death's Reflection
Hino Horror Volume 11: Gallery of Horrors (Kyoufu Gallery)
Hino Horror Volume 12: Mystique Mandala of Hell (Kaiki! Jigoku Mandara)
Hino Horror Volume 13: Zipangu Night
Hino Horror Volume 14: Skin and Bone

From: Easy Going Scans

In a time when gods ruled with cruelty, no one dared to oppose them? A girl was offered to the wind god as a sacrifice. A tribe leader sets off on a journey of redemption while trying to save the girl he loves and make her his wife. Kiron, while defying the gods will, departs for a difficult journey. Will he be successful? And what kind of obstacles will the gods throw at him?

Ghislain Perdium, the Mercenary King and one of the continent's top seven, started a great war in an attempt to avenge his fallen family.

His plans of revenge were going smoothly until he was slain by Idun, who he had never expected to make an appearance. Ghislain thought he died, but he woke up as a younger version of himself from before the fall of his household.

With this second chance, he decided to fix all the wrong pieces of the puzzle and avoid making the same mistakes he did in his past life!

Cyan Vert, illegitimate son of the Duke and the empire's greatest assassin, is betrayed by the righteous brother whose shadow he's always lived in. But just before the fatal blow strikes his throat, Cyan awakes to find he's just a boy again. The young lord has been reborn, and this time, he's not going to live in anyone's shadow!

(Source: WEBTOON)

The great sage, Grameos, tired of his current life as a famous mage, decided to reincarnate as a young boy 200 years in the future. Before reincarnating, he places two magic restraint seals on his hands, so that he can hide his enormous magical power after he is reborn. His motto for the next life is "Hide my powers, don't stand out, and be free".

The infamous leader of the assassins known as the Shadows, Raon, had lived his entire life as a dog on a leash.

However, through a twist of fate, he obtained a new life—as the grandson of Glenn Zieghart, the Destructive King of the North!

He prepares to use the Ring of Fire he still possesses as an infant to begin cultivating when he's diagnosed with the Curse of Frost.

With the odds stacked against him, will he be able to finally stand on his own feet and live life by his own will, to become the strongest swordsman on the continent?

“I will slay anyone standing in my way of revenge…
even if it is a god.”

“Until we graduate, become mine. Or even If I do this——” Princess Alicia hates the idea of a political marriage, so her mother offers her an alternative cross-dress and enter the boys-only magic academy, and choose one of the suitors to be her fiancé! Though it sounds impossible, Alicia fell in love with Lucius, an incredibly handsome gentleman who isn’t even a potential suitor. Yet somehow, Lucius knew right away that Alicia was a girl, and stole a kiss! Alicia reincarnated into another world based on her beloved BL short novel, and her path to romance begins…! After much anticipation, everyone’s favorite romance fantasy has become a manga!

This the long tale of a reincarnated elf who become a living legend!

After his ordinary life came to an end in an accident, Minoru was reincarnated as an elf who have a average lifespan of 1000 years. Due to the regret of not being able to do anything in his previous life, he decided to leave his village and travel in this life to leave behind evidence that he once lived in this world. However, the head of the elf clan imposes a certain trial—?!

Fia, who is aiming to be a knight in a family of knights, remembers her previous life as a "Grand Saint" when she was on the verge of dying. The saint is currently a highly important and respected profession because and is on the verge of extinction! The holy power she can use happens to be the "lost magic" of myths.

In her previous life, she was threatened by the right arm of the Demon King, saying, "I'll kill you again if you're reborn as a saint."

"If I use such power, I wonder if I would be caught and killed once again…"

Watch as she tries to live a simple life as a knight, hiding the fact that she's a Grand Saint!

A normal office worker, Toru Minasuki, was swallowed up by a dimensional fissure and reincarnated into a different world. Upon reincarnation, Toru was given a [skill board] by God. Make the most of it to acquire all the necessary skills! Even though he is an "inferior person," he'll make his way to the top!
Webnovel: https://ncode.syosetu.com/n8516fu/

Reid, a young hero with the strongest physical strength, and Elria, a beautiful sage with the strongest magic prowess.

They continued to fight as rivals in opposing enemy nations, but their relationship came to an end with the sudden death of Elria… Then, a thousand years later,

Reincarnated in a world where magic reigns supreme, but he who has retained the strongest physical strength from his previous life, Reid, was reunited with Elria, who has also been reincarnated―

“Hey, Reid— I want you to marry me.”

“…Huh?”

The two, who have become the strongest unaware lovey-dovey couple in a thousand years, enrolled in the Royal Magic Academy to decide who is stronger!

Reborn as the third prince of a tiny and insignificant country, Hero happens to learn the forbidden-yet-powerful art of alchemy. Combined with his knowledge from modern-day Japan, Hero's abilities grow beyond what anyone in his world could fathom! With his newly-acquired powers, he’ll bring his country back from the verge of extinction...! A combination of modern-day knowledge and alchemy to turn a weak little country into a prosperous nation!

I was reborn as a princess in the world an otome game with memories of my previous life.
Wait, what? I'm the Heroine's love rival? You're kidding! I have no intention of falling in love with any of those pathetic guys, because the one I like is a support character, the Commander of the Royal Knights.

Except the Heroine, after being reincarnated in this shitty game where the support characters are way better than the love interests, is threatening to bring down my own life with flags, and I'm determined to strike them down.