Kazusa Yuu, a Japanese high school student interested in food and camping, dies in a traffic accident and ends up reincarnated in the wilderness in another world. He must learn to survive in an unfamiliar environment, learn the powers he was granted and the magic of the world that is based on eating other creatures, and rescue fair maidens in distress to feed them and build up his harem.

An action packed suspense story of a boy who obtains the absolute authority!
The story centers around a boy named Hwang Chomin who spends his high school days while enduring its unjust violent treatment. Being informed of his isolated brother's passing away, he receives his phone and confronts the truth about his brother. He learns that his brother is the leader of a notorius ring called [Emperor's Division]. Upon learning that he decides to impersonate his brother and take control of the division by passing judgment on it's scums. And so the King's Game that must be never revealed begins!

As life gets harder, Ian pushes his emotions away and resists. His father's violence and debts increase. Thee misfortunes continued and his body became increasingly numb, he accidentally walks in on an illegal fight and receives an offer.

"If you get in the game, I will give you all the money on this floor."

His survival period begins, where he must survive in an illegal fighting arena.

A fantasy about a knight who lost everything and his story of survival strategy and territory restoration!

One day, when the lord's son, Agredios, came back to the village after a long hunt, the sounds of villagers bustling and their laughter were all gone. After learning that the "witch" that lives in the "Forbidden Forest" was the cause of their demise, his despair turned to rage and he stormed into the forest for revenge alone.

It has been decades since labyrinths first appeared in the modern world of Japan, bringing with them monsters and related catastrophes. With this brought many changes; the biggest one being a new profession called 'Adventurer' and the monster cards they use to summon their own monsters to fight and conquer labyrinths with.

Kitagawa Utamaro, nickname Maro, is a mob highschooler who becomes an adventurer due to being incited by a former friend of his having sudden social success among their peers simply by becoming an adventurer himself.
However, things aren't quite as easy for Maro. Just becoming an adventurer in name only isn't enough for him to gain his spotlight, giving him no recourse but to actually tackle labyrinths with the peculiar and not very versatile monster cards that he barely manages to scrape up.

From ANN:

Guts, known as the Black Swordsman, seeks sanctuary from the demonic forces attracted to him and his woman because of a demonic mark on their necks, and also vengeance against the man who branded him as an unholy sacrifice. Aided only by his titanic strength gained from a harsh childhood lived with mercenaries, a gigantic sword, and an iron prosthetic left hand, Guts must struggle against his bleak destiny, all the while fighting with a rage that might strip him of his humanity.

Warning: This manga is for mature audiences only, since it has sexual content and graphic violence (gore, blood, rape, etc). Definitely not for the weak hearted.

The 1988 Prototype chapter won a prize at the Comi Manga School Miura attended and the main series won the Tezuka Osamu Award for Excellence in 2002.

Tsurumi Asuta is a 17-year-old second year high school student. He was an apprentice cook working at the public diner "Tsurumi-ya" that was managed by his father. One day, Tsurumi-ya is hit by fire and Asuta dived inside the burning shop in order to save his father's santoku knife which is said to be his father soul, where he found demise.

When he came to, he was in the midst of a strange jungle. He was then attacked by a beast resembling a boar, but Asuta was saved by a girl named Ai Fa claiming herself as part of the "People of Morihen." It was then that he realized he was in another world.

Tower Defense & Dungeon Attack RPG
I saw the ending to the game no one was able to clear.
But, when I came to my senses, I was inside of the game.
In fact, I was in the tutorial stage, a place where strategy was impossible.
“I’ll clear this bullshit game no matter what……!”

High school student Boji Nichiro is isolated from the rest of the world due to fierce bullying. One day, however, the world is transformed by the "dungeonisation" phenomenon! In the midst of the chaos, Nichiro awakens the unique skill "Shop". It was an out-of-the-box skill that allowed him to buy everything from food and daily necessities to unrealistic items! The start of a painful and "wacky" modern fantasy from "Shosetsu-kaerou"!

Having lived a useless 30 years of his life, the main character (Saito Jinkuro) is hit by a truck. When he wakes up, he enters the body of "Dzink Norland", the 14-year-old son of an aristocrat who served as his Highness' escort. But due to the lack of skills with a spear, which were inherent in all members of his family, and terrible behavior, he was kicked out of the guard post, and then completely deported from the country... In addition to these problems, a window pops up before the eyes of the protagonist with information about "Elsa", his nanny. Another world, deportation from the country and windows like in video games? What will the main character do?

Web novel: https://ncode.syosetu.com/n9677fw/

Tsukimiya is a dutiful kid who has been looking after his family since his mother's passing, and a popular pretty boy at school, but he rejects all those who confess to him due to an unrequited love he holds for one of his teachers. However he suddenly finds himself kidnapped by a group of beautiful women, who promise him a life of daily torture from now on.

When Ivy was born into this world, she remembered her past life.
Remembering her preincarnation, she strove to avoid strife.
But fate curdled at the status check, when kids learn who they are.
For she had only one skill - Taming - and not a single star.

Ivy was weak from the start - at most, she could tame a slime.
Her parents hated her for it (apparently, being weak is a crime?)
Only one woman in her village would treat her as her own.
But after she "died", Ivy got the hint and ran from home.

She met a slime and named him Sora (she's a gamer?)
And such begins our story - of a small girl who's a tamer.
Yes, you may be scoffing at that tag called "isekai"
But you know the rules, and so do I.

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.

A mysterious mansion has towered proudly over the Tokyo district of Numanakarai since the Taisho period. Those who enter either never escape, or leave having experienced horrors untold, and with the desire to take revenge.

Set on a solitary island in the distant sea, a dangerous school life begins!

Kaoru Jahana, a boy who aspires to become a true man, begins his high school life on a solitary island in the sea. There, he meets a charming girl, Kanra, who is actually a demon who feeds on men's spirits...and it turns out that all the women on this island are the same demons!?

Ikuto Touhohin just had a last fight with his old man, one that led him to make a rash decision to run away from home. He boards a ship, deciding to take a vacation, but the ship is suddenly hit by a huge storm--one that sends Ikuto overboard! When he regains consciousness, he realizes he is still alive… on some island. An isolated island. An isolated island with nothing but girls and talking animals. Stranded on an island with only girls, no electricity, gas, radio, television… like he was back in the stone age.

Anezaki Satoru, a Genius had his childhood friend murdered and raped, he then tracks down her 15 killers and he murders them, he then gets sentenced to death for his crimes of murder, after being executed though, he found himself in a parallel apocalyptic world...

I'll take back my life. A cruel and beautiful revenge story of a princess who became a prostitute. Princess Evita lived happily in a small country. However, she was attacked by a neighboring country, her land taken away, and her family was brutally killed. The surviving Evita was sold to a brothel and lived as a prostitute. In the middle off all this, a man from the royal family that she hates appears as a customer...

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.

Based on a popular game from Niconico.
Sara Chidouin returns home from school late one night to discover that something's gone terribly wrong.
When she comes to, she finds herself, her friend Joe, and 9 other people trapped in a mysterious place.
Placed in life-and-death situations, they must come to an agreement about what they should do - and who should die.