The power of Valhalla's warriors is called Saga. It is the mighty, magical power born from their achievements and deeds in their former lives. Thus, the more stories and legends of these warriors spread and linger in the hearts of many, the stronger their Saga becomes.

Tae Ho himself was certainly no warrior. However, he was the world's top professional gamer. In the game world of Dark Age, his character, Dragon Knight Kalsted could rightly be called a legend in his own right.

His achievements, his story.

All the accomplishments that the Dragon Knight Kalsted had accumulated in the game!
[Saga: Immortal Warrior] The story of the immortal warrior, Lee Tae Ho, unfolds on the battlefield of the gods, Valhalla. To put an end to Ragnarok, which threatens the world's very existence, a new Saga begins at this very moment.

From MangaHelpers :
High school student Misumi Makoto is called into a fantasy world by the god Tsukuyomi, in order to be a hero. However, powerful others in this world aren't as thrilled to have him there, and they kick him to the edge of the world just as Tsukuyomi declares that he must leave Makoto to find his own way. Now it's up to Makoto to find his own way.

Suddenly appearing in a different world, it looks like I got caught up in a Hero Summoning. And of course, I’m not the Hero, but it’s another guy……and while being very cautious and scared of the cliche of the cliche-like development, I was thrown into the maelstrom of war……or not.

The Demon Lord? It was defeated a thousand years ago. Hero? He’s just the main actor in a festival. Nobles? They’re kindly taking care of us. The Demon Race? They have good relationships with Humans. Wars? It’s already 800 years since the last one. Monsters? The Guild and Order of Knight are taking care of them. Return to Earth? It is eventually No-Risk.

What I’m planning after being caught up into this? I’m gonna enjoy the life in a different world as much as I want to, go on a cultural exchange and sightseeing, and after experiencing the festival that is only held once every ten years… I shall go home safely.

The other world was at Peace.

A kind world where the three races, the Spirit World’s Magical Races, the Celestial World’s Divine Races, the Human World’s Human Races, they are kind neighbors to each other, with everyone living a peaceful and fulfilling life.

But although I wished to peacefully spend a year before my return, for some reason, the heavyweights of this world keeps gathering around me, and…

Meirin, a junior high schooler, is the real identity of the famous "Dr. Rin" who heads a very popular feng sui website. She is in love with her best friend Asuka, a member of the soccer team. "Dr. Rin"'s advice has granted success for many, yet Meirin's own love life doesn't seem to be going too smoothly?

An earlier work by the mangaka of the popular "Beauty Pop"!

Bookstore manager Tenma hasn't shown up for work or called in today. His employee, Asuka, worried about him, goes to his house and discovers... he's been petrified by his medusa wife! But surely they can return him to normal?

Tenma left a letter saying that if anything happens to him, Asuka should take care of his wife. But Asuka is a guy who can only get excited by other mens' wives. Also, and most importantly for the plot - hot medusa wife.

I’m Shinomiya Hokage, a 3rd-year high-school boy who dreams of a survival life. One day, everyone in my school transferred to a mysterious island in a parallel world. I woke up in an unknown cave and I started moving on my own. Then, I met up with some of my classmates. My knowledge and tools in survival shines through. I was a plain guy in school but I’m the leader in this world.

A new story begins with Watanuki and Yuuko, while guests wishes are granted. Description by LuffyNoTomo

Liam Sera Banfield is a reincarnator.

He was reincarnated into a fantasy universe of swords and magic, but at a time that civilization was already making advancements into outer space. The setting takes place in an intergalactic empire, a space opera-like universe where humanoid weapons and spaceships do battle. Liam, who had incarnated into an aristocratic family in a monarchic society, has the ambition to one day become an evil lord. In his previous life, Liam had unfortunately lost everything and died in despair.

"It’s foolish to live for others. I will live for myself."

Holding those feelings in his chest, he starts towards his second life, but is instead worshipped as a virtuous ruler from his difference in values. Will Liam be able to safely become an evil lord?

The adventures of Marciel and his dragons continues. In Koryuu Monogatari, the baby dragons have grown up a little.

[The Strongest Guild, Griffin!
SSS Ranker Gang Tae Ha challenges them alone!
But he meets his death after a fierce battle.
However…

“…I am this pig?”

I open my eyes, and it’s Murim?
I am Yu Shin Un, the ruffian of Baek Un Clan?
A chaotic situation with no time to rest.
In the midst of incoming death!

“You guys have no idea who I am?”

Necromancy from former life.
Martial arts from current life.
He who wields both power!
Now shakes the destiny of the World!]

I drew a lottery at the Shopping District and won the privilege to go to another world. After drawing a lot of balls, unexpectedly I got a cheat-like skill. Silencing those who are noisy and getting hold of all the things that I want. I will satisfy all my desires.

Japanese Light Novel (Bookwalker): https://bookwalker.jp/de3a938b85-e9d2-4f4d-9161-49b2f44782a3/

Mukouda Tsuyoshi was summoned from modern Japan to a different world of sword and magic. He thought of what kind of a huge adventure was waiting for him, but actually, Mukouda is just a civilian who got caught in a "Hero Summoning" by accident!! And that Mukouda's base status is very shabby compared to the legitimate heroes...
The only thing that he could rely on in this world is his unique skill "Net Supermarket," which enables him to order goods from modern Japan, and prepare them for various personas attracted by a different world's food...

In another world, the Hero and the Demon King continued to oppose each other. As their great magic collided, the explosion crossed over worlds and destroyed a classroom full of high school students. The victims who died in that explosion will be reincarnated in that alternate world. Our heroine, who has the lowest standing in the class, was reincarnated into a spider. She nevertheless faces this challenge head-on with great determination, and adapts to it surprisingly quickly. This is the story of how our protagonist, who was reborn as a weak spider monster, does whatever needed to survive.

Sawada Honoka is a 14-year-old girl who is very timid. She easily gets bullied by other classmates. Honoka is a non-believer in God, angels, and devils. Though one day, a devil baby was dropped into her room while she was sleeping. What will Honoka believe now?

Toshinori Dokuraba, 35 years old. A so-called single aristocrat in Japan who enjoyed a single life without wife and children, even though he was tall, handsome, highly educated and had a high income. One day, he died alone at home.

However, he was liked by Hitorigami, the God of another world, and was able to reincarnate in that world. Reborn as Zirc Louren with skills and blessings from the God, he lived a new rosy life in a different world - then he turned 28 years old and enjoyed the single life again...

This is a story about the life of a single aristocrat who never gets married even if he reincarnates in another world.

Exploring undeveloped unexplored regions from scratch! Creating and building a city with plant magic!
The boy Elt, who reincarnated as an aristocrat, was branded as incompetent and was thrown out as a manager of a remote area with zero territories.
However, his "plant magic" was the best all-purpose magic for territorial development! As
he cultivated by utilizing the magic that produces from crops to buildings and the knowledge of the previous life , the number of territories increased and became lively.
Moreover, the territory that should have nothing is actually a treasure trove.
A pioneering record of a different world, the opening of comicalization!

One night, Eizo, a hapless corporate slave, saves a cat and gets hit by a truck. The cat which seems to be related to a parallel world, in return for his help, grants Eizo a skill of his wish and reincarnates him to another world. Eizo, who has craftsmanship as a hobby and wishes to use this skill for a living, chooses to be reincarnated as a blacksmith. And so he starts his life in another world as a blacksmith just as he wishes. However, Eizo's creations are at another different level that will shake this new world.

Author’s Twitter: https://twitter.com/tamamaru
Artist's Twitter: https://twitter.com/himori_yoshino
Kadokawa Books (LN): https://kadokawabooks.jp/product/kajiyadehajimeruisekai/
Web Novel: https://ncode.syosetu.com/n7266fe/

Diarin, a priestess without any noteworthy family background or connections, always gets the toughest assignments. So when her boss tells her to help Ceres, a war hero, reintegrate into society, she decides to stop being a pushover and get as much as she can out of it, including a juicy promotion. But upon reaching Ceres' manor, she’s greeted by a growling hound instead of a human. Tasked with the impossible job of turning the mad dog into a proper gentleman, she dedicates herself to caring for him. But his unexpected obsession with her was never part of her plan.

Touya, the strongest player in the game Pandemic World Online, had won so many items that he decided to create an alternate account to store the extra ones. While playing this very game in his second account, he was summoned to another world as a character he made, where the people were merrily expecting a hero. However, when it is known that he doesn't have the title of a hero, he is discarded and replaced by another person. Now, he must survive in an another world with the account he merely used to store his extra items in.

Links:
Original Web Novel: https://ncode.syosetu.com/n9275ei/ (Japanese)

Frey Raon Starlight was the hero who killed his family and comrades and destroyed the world. His goal was to return to the past, unlock a "hidden route" to truly save the world, and achieve peace.

As planned, he successfully returns to the past and gains access to the hidden route. However, his relief is short-lived as he is confronted with an unexpected truth: the five heroines he killed in his previous life have retained their memories and are now trying to kill him...!

Can Frey, under such extreme circumstances, save the world this time?