From MangaHelpers:

19-year-old Roji Shizuru has a crush on a fellow university student, Nana, but there always seems to be complications when he tries to get closer to her. For one thing, he's afraid his hot friend Tachibana Masaki will steal her. Beyond that, the main complication comes from the interference of children, specifically one odd child called Maida Kokoro, who keeps clinging to Shizuru and calling him 'mama.'

If you think this has a happy ending, you read the title.

Gray, a B-rank adventurer, was supposed to be just a mob character in the RPG "Bright Fantasy." However, by chance, he saved an orphan who was attacked by thugs on the roadside and decided to raise him as his father. But the orphan turned out to be the hero of this world, "Iska"!

This choice would greatly change the fate of the world.

From Endless Abyss:

Hatogaya, a man who loved baseball and yet left it, is set up to take the fall for his company and gets sent to prison. A high-school principal and his former coach whose school is about to lose its baseball program bails Hatogaya out. But, in exchange for getting him out of jail, he has to coach the schools not-so-great baseball team.

Sangwoo, a college student, decided to join an awakening program on an ordinary day.

A system that enables even an average person to learn skills. The government has proceeded with this awakening program since a few years ago. Thus most of the population took the program and is awakened now.

Sangwoo also participates in the program just like the others and gets cloning skill.

The people around him think that the clone is just an illusion, but Sangwoo realises that the clone is real and decides to become a hunter.
As Sangwoo was living well, using his skill, Jumper George Lucas appeared in front of him.
After seeing the cloning skill of Sangwoo, he saw its potential and thus started to get interested in Sangwoo.
When Sangwoo noticed what Lucas was thinking, he felt it to be a part of a big plan and couldn’t help but be nervous.

Eventually, as Sangwoo was living as a hunter, he discovered Lucas’ plan and the dark secret behind it…

The world is encased in winter due to the advances of the Ice Kingdom. Kind-hearted Otr, who dreams of being a warrior like his dad, has been entrusted with keeping the fires burning as a cook in the fortress. But when the fortress is attacked by the demonic army of the Ice Kingdom, the people and the flame are in danger of being snuffed out. Can Otr awaken a power that can turn the tide? A hero's journey of fire and ice now begins! (MANGA Plus)

The very last moment before the novel was about the end, the strongest villain met a pitiful fate.

But that wasn't the end.

"So, this is how I die."

I, who was once the author, woke up as the fox-eyed villian who was never once understood.

A fallen family. A life thrown away for revenge. A future sealed in tragedy.

I'm going to rewrite it all.

This villain's end... will be reversed.

“Hey, don’t get confused. I’ve never thought of you as my little brother. You don’t even know your right place.”
That was the dagger that hurt the most.
Han Myoung Woo.
A child of a wealthy family with a quick mind.
But god didn’t give him everything.
A near incurable genetic heart disease
He did his best in order to earn the respect of the people around him.
But his father, the chairman, and his family members never took him seriously.

That was when an accident suddenly struck him.
And…
He woke up in the body of the severely injured student, Kim Cheol Min.

"Standing above all and controlling the masses. That is the way of life I aspire to!"

Ikurumi Akuto is the top of his class in every subject, including sports, and he knows it. The son of a well-known politician, a degree of arrogance is to be expected. But Akuto takes it to a new extreme with his condescending and self-important attitude. It doesn't help matters that his effeminate voice makes him a target of constant ridicule by his "lower class" schoolmates.

Then Harusaka Nari enters his life, and Akuto's controlling personality is thrown off kilter by the optimistic but manipulating young seiyuu. With his life on the line, he agrees to be a voice in her Anime Research Society's project for the upcoming Cultural Festival... as the female lead?!

High school student Mikoshiba Ryouma was summoned to a different world in the middle of a war. Sensing the malice from the one who summoned him (a summoner of the O'ltormea empire), he uses his martial arts to run away, killing important people of the empire during his escape. After the escape, he rescues two twin sisters from the hands of thieves. The sisters who can use magic, swear to serve him as subordinates. Thus, Ryouma begins his journey on the path of the supreme ruler.

After losing his leg as a startup adventurer, he retired to his hometown in the countryside. Doing things such as collecting medicinal herbs, exterminating magic beasts and wild beasts, and helping with the villagers' farm work, it's hard to decide whether to call our protagonist an adventurer or a handyman. And while doing these things his age quickly approached thirty.

One day while searching the mountains for herbs, he discovered an abandoned child. Thinking that he couldn't just leave it, he took it home and raised it until his age approached forty. His now grown-up daughter had also wanted to become an adventurer, likely from growing up watching her father. Although her father had taught her the sword since she was young for self-defense, her talent at it was quite impressive. Thinking that it would be better for her not to be stuck out in the country for the rest of her life, our protagonist sent her to the adventurers' guild in the Capital. His daughter officially became an adventurer.

After another five years, the protagonist, now in his forties, is still acting as a pseudo-adventurer in the countryside. However his daughter is now a distinguished S Class adventurer but hasn't returned home once yet? Just when will I get to see Daddy again?!??

"I did it again...!"

The Hero who can't seem to set out on his journey!!

The protagonist, who was reincarnated into another world, becomes a hero and receives the task of defeating the Demon King. To repay the world that accepted him , he decides to set out on a journey... However, he can't seem to leave the first village, as he is constantly tempted by charming heroines such as the female priestess, his childhood friend who is a magician, and so on!

Thus, the birth of the "I did it again...!" type hero!

The story revolves around three teenagers: Nomiya Tomomi, a high school dropout, Togawa Kiyoharu, an ex-sprinter who now plays wheelchair basketball and Takahashi Hisanobu, a popular leader of the high school's basketball team who now finds himself a paraplegic after an accident. Real features a cast of characters who find themselves being marginalized by society, but are all united by one common feature: a desire to play basketball, with no place to play it in. Nomiya, being a high school dropout, has no future in his life. Togawa, being a difficult personality, finds himself constantly feuding with his own teammates. Takahashi, once a popular team leader, now finds himself being unable to move from the chest down. Real also deals with the reality of physical disabilities, and the psychological inferiority that the characters struggle against. The characters break through their own psychological barriers bit by bit.

Note: Received the Excellence Award at the 5th Japan Media Arts Festival in 2001.

One day, Raizou ​​Takakura, an average salaryman, had a heart attack and his life ended that day. But, he got a second life in a different world.

Reincarnated with strong skills― wasn't happened to him, instead, he was reincarnated as a foot soldier in a small country, Highserk Empire, which is surrounded by large countries. With a new name, Walm, he was thrown into the frontlines of a war. Covered in blood and stench of death, along his comrades, he was slipping through the life-or-death situations.

An adventurer party with members who could use powerful magic, transferees with overwhelming power called the "heroes." In a deadly battle with them, Walm gradually developed his talent as a warrior which would've never awaken if he were to stay in times of peace. While his eyes becoming dark and muddy over time.

Web Novel (Japanese): https://ncode.syosetu.com/n6680gq

The fluffy and strongest Holy Beast! One day Seraphione, a nobleman's daughter, met Roux and recalled her previous life's memories of a Japanese woman in her thirties. [I've been reborn in another world, and not only that but I'm a villain--!?] If they find out about my cheat magic then it means the destruction end!

However, although she knows that, she still loves magic and carelessly enters into a magical contract with Roux. If it continues like this it'll become dangerous! In that case let's train and aim to become an adventurer!

The sometimes happy, sometimes sad, and a tad stressful daily life of "some sort of small, cute creature" known as Chiikawa. Chiikawa enjoys delicious food with bees and rabbits, toils hard every day for the rewards of work, and still maintains a smile.

The iron widow, the spider widow, male hunter, the witch of Neuwanstein castle, the embarrassment of noble ladies....... These were all the words used to describe the Marchioness, Suri Van Neuwanstein. Despite receiving such criticism from the world, she raised her 'children', who were unrelated to her by blood and were old enough to be called her siblings. And finally, on the day of the first son Jeremy’s wedding, she felt that all her hard work had tied all the loose ends together. But she had been terribly mistaken. After hearing the message requesting her to not attend the wedding, she got caught up in an accident and died while leaving the castle. But when she opened her eyes, she woke up on the day of her husband's funeral, seven years ago. I refuse to suffer anymore. I won’t live as I had in the past a second time!

Baphomet, boss of the Tower of Abyss, is reborn as a human after becoming envious of the hunters who are always trying to kill him. In his newfound form, Baphomet is free to seek new forms of entertainment in the outside world.

I remember the memory of my previous life when I was abused by my father for the experiment. Then I realized. According to my previous life, this is the world of fantasy fiction I’ve read. That she was born with a minor role and died before the novel even started. Ariadne thought calmly, ‘I am screwed.’

She was also screwed on a global basis, this novel has a bad ending. The end of this 10-volume Munchkin (overpowered) fantasy novel is it was the failure of the protagonist and the destruction of the world.

Yuta, a ronin student, moves to Tokyo with hopes to enter university. With no money, he moves into a share house filled with beautiful women.