A young boy named Mikazuki Kenya was abandoned by his parents, bullied in high school, and left in solitude. At the brink of despair, he encounters a fateful meeting in his only hobby, VR gaming. A meeting with Kaguya and Reina, the heroines from the immensely popular game Knight of Giant. The time spent with the two heroines saved him, and he was head over heels for both of them.

However, in the story, one of them is destined to die. To change that fate, he dedicated his life to mastering the game and becoming the strongest in the world. Suddenly, Kenya finds himself entering the world of Knight of Giant?!

He was suddenly summoned to another world one day.
Monsters poured out, a huge disaster incoming.
His ability the lowest.

[Player's level is low]
[Your level is hopeless]

It doesn't matter whether you're the chosen warrior, a talented wizard,
or someone who travelled back in time.
One must do everything they can,

in order to survive.

The Regressor's Instruction Manual.

"It doesn't matter if I'm trash." Is there anyone who wouldn't do anything they could to survive?

From MangaHelpers:
People have been created that are human-animal hybrids, and powerful businesses bet on the outcome of their duels. College student Nomoto Yuuya's casual acquaintances ask him to drive them around to pick up girls one day, which he soon finds out means by force. The girl they kidnap is an animal-human hybrid named Hitomi, who slaughters all of them except Yuuya. Hitomi is a honey badger, which has been called the most fearless of all animals. Now Hitomi is assigned to stay with Yuuya, for his protection.

Tales of a high-school calligraphy club.
A story about a high-school calligraphy club on the verge of breaking up that enters in a major competition while overcoming problems. Yuki, a promising female judoist, and Yukari, a quiet Canadian-raised boy who just returned to Japan, end up joining the club for the sake of maintaining the membership required to keep the club. Together with the old club members with unique characters, they gradually discover the fun of calligraphy and work together to win in the competition.

Note: Was nominated for 2008 and 2009 Manga Taisho Awards.

Fuyuki is a beautiful and cool gal! But there's a secret side of her that she only shows in front of her husband...? A cute love comedy with a gal wife!

Yuito Kujo, a high school student, constantly compares himself to his exceptional older brother and sees himself as a lesser, "degraded version." Caught in a spiral of self-deprecation, his adolescence turns even darker when he discovers that his childhood crush, Suzuno, is in love with his older brother. But just as Yuito begins to lose hope, Suzuno's older sister, Kano—a college gal—develops intense, overwhelming feelings for him...!?

Shunpei, a loner high schooler, became a gyaru after saving the god of gyaru from drowning. Through his mother's connections, he was able to transfer to an all-girls school, but it was stuffed to the brim with gyarus!
Every day is a sensory overload for Shunpei, who's never even talked to a girl, let alone a gyaru.

It's the beginning of an introverted high school guy => gender-swapped gyaru comedy!

From MangaHelpers:

History classes have never interested Saburo. He never saw the point of learning something that happened in the past, let alone a few hundred years ago. But when he falls off a wall, he travels through a wormhole and ends up in 16th century ancient Japan. He meets a very young Oda Nobunaga, one of the most influential figures in Japanese history, who turns out to be identical in appearance as Saburo. The real Nobunaga, sick of the castle life and wanting to travel, orders Saburo to take his place. Without knowing how to get back to his time, Saburo tries to make sure history isn’t rewritten for the infamous Oda Nobunaga. [vyc]

Won the 57th Shogakukan Manga Award for shounen.

"I want to live the opposite way in my next life..." Cheonma, who had only fear and awe, gets a clue to properly learn spiritual magic on his death. Spiritual magic is not just about coveting the souls of others. In this way, Cheonma wakes up in the body of Confucius Byeoktaesan, who may die at any moment...

Witches suddenly declare war against humans, causing two-thirds of the world to fall apart.
They summon monsters called "Supporters" and devastate human residences but why?
Survivors gather people with the power to combat the witches and called them Witch Hunters! Tasha Godspell is one of the strongest nicknamed "The Marksman" along with his "Jack-O-Lantern" looking Supporter. He fights the witches but cannot really bring himself to hate them.

More than ten years have passed since dungeons suddenly appeared on Earth. In a world where people with excellent skills play an active role as adventurers, the skill that high school student Takeshi Miyamoto has discovered is... "breast correction"!?

Takeshi is confused by the unique skill he has never seen or heard of. But there seems to be a surprising number of girls who need it.

The manga centers on Yūma Fujikura, a constantly bullied first year high school student. When a classmate named Ryō Ameri, nicknamed "Amelie," helps him out one day, Yūma tells him not to get any more involved, or else the bullies will target Amelie too. In response to this, Amelie only tells Yūma that he would commit murder for him if Yūma wanted.

The story is set in a world where supernatural powers exist through science, and magic exists through religion.

In the story, Touma Kamijou is an ordinary high school boy with terrible academic scores and a power called Imagine Breaker. Imagine Breaker can defeat any other power, but it also undermines Kamijou's own good luck. His Imagine Breaker's immense strength is literally immeasurable, so hapless Kamijou is listed at the supernatural level of 0. He happens to meet a girl in white hanging off his window balcony. The girl says she is being chased by sorcerers, and Kamijou learns that the girl is a Church of England nun whose memories have been forcibly replaced by Index-Librorum-Prohibitorum — the 103,000 forbidden texts of the Church.

University student Kang Ji-ho, accidentally saw Seon Woo-hui's breasts at a drinking party, and avoids her because she couldn't resist the desire to see them again.

"Just give it to me straight. Why are you avoiding me?"
“…If I tell you straight up, won’t you get angry?”
"No. If you don't tell me, I'll kill you."

I-I mean...

“When I look at you… I keep wanting to see your boobs…”

At first, she thought it was a joke. But when she realized it wasn’t, Woo-hui decided to pull a mean prank.

"Shall I show you my boobs?"
“…Do you want to touch it?”

A super-class dragoon group-Cyril, a boy who was banished from the S-class guild "Lindworm" for some reason. What he had hidden was ... the ability to "talk" with the dragons, which was unconventional!
Cyril who met unique dragons and launched his own guild. Perhaps because of its extraordinary qualities, the level of the guild soars at the fastest rate in history! Cyril, whose arm was recognized, will make a name for himself as a non-standard dragon knight.

Local bullies tormented Kotaro when he was a youngster.
They were the skilled wrestler Akari.
Kanae, a basketball prodigy, and Shigure, a prodigy in video games.

Every day, Kotaro competed against these three guys in their respective sports with the intention of winning. Unfortunately, he was no match for them.

As a senior in high school, Kotaro now has another opportunity to confront them and exact his retribution...!

But he will discover a secret that he never would have expected....

Kobayashi lives alone in an apartment, until one day, Tooru appeared and they ended up living together. Tooru looks down on humans as inferior and foolish. But having been saved by Kobayashi-san, she does everything she can to repay the debt and help her with various things, although not everything goes according to plan. A mythical everyday life comedy about a hard working office lady living with a dragon girl.

Standing at the crossroads of life; the important choices - “Flags”. Hatate Souta, a young man who can see these flags, transferred to “Hatagaya Academy”, a prestigious school in the metropolitan area. Not only does he meet beautiful girls in his busy school life, he even goes as far as living with them under the same roof! Surrounded by these flags, this enviable romantic comedy begins!

If you become a hero and defeat the Demon King, a life of idleness awaits you...! This is what the young man Jirei believed, and he worked hard day and night to achieve his goal. However, when he found out that the heroes who defeated the Demon King were the ones who were doing all the hard work, he ran away. But the girls that Jirei had been saving on his journeys before he knew it came pouring in one after another to win his heart and body...?

Who knew that even a stationary plant could be surprisingly capable?!

Our protagonist is a saint—or was, until she was betrayed by one of her fellow saint apprentices as well as her fiancé, a hero.
In her final moments, she recalls her previous life, when she was just a normal Japanese high school girl, but that doesn't help the fact that she's being eaten alive by a massive plant monster.

And yet, by a stroke of luck, she doesn't die for good, but instead reincarnates as said plant monster. With the upper half of a human and the lower half of a plant, she must now spend her life as an Alraune.

And so, she tries to live the peaceful life of a plant, photosynthesizing all day!
Welcome to the diary of a plant girl who just wants some peace and quiet, but something always gets in her way!

Web novel: https://ncode.syosetu.com/n4444ge/