‘This is a development that I know of.’ The moment he thought that, the world had been destroyed, and a new universe had unfolded. The new life of an ordinary reader begins within the world of the novel, a novel that he alone had finished.

Shim Cheongi threw herself into the sea of Indangsu! What will happen when she wakes up in a lazy dragon's dungeon? Meet many cute monsters while living a delicious, symbiotic life!

From MangaHelpers:
A young noblewoman once dreamed of becoming a magic user like in the old tales, but her time in magic school has dimmed her passion. One day, a mysterious man comes to her rescue in the forest, using magic like in the old stories. Despite the fact that he is clearly skilled in magic, he is thrilled by the idea of learning new techniques. Since the only way to do that in this day and age is in magic school, he alters his appearance to school-age and decides to accompany her back to school.

One day, the Marquess’s daughter Julianne suddenly regained the memories of her previous life and reflected on her behavior up to this point.

A life of luxury, bullying her siblings and stalking her fiancé...... A horrible personality and overweight appearance, devoted only to wrongdoings that belonged to the villainess of the novel she read in her past life.

In any case if it is a "serves you right" fate from now on, then it will be after I get a beautiful body and soul!

She, who thought this, started a diet together with showing a wholehearted devotion to her family —?!

(GS Team)

A human boy name Light is kicked out from the adventurer party called the “Race Union(gathering of races)” by his trusted comrades.

Gratia, a girl considered useless and despised by her family, has a revealing dream where a mysterious man predicts a great future for her. She soon discovers that she is the lost daughter of the influential Luciffero family. In a surprising event, after being attacked, a golden light erupts from Gratia, forcing everyone around her to close their eyes.

When the light dissipates, young Gratia disappears and in her place an adult version of herself appears, with distinct features of Luciffero. With an imposing stature and undeniable beauty, she comes across Nea, her mother, and realizes that the transformation expected for the future happened that day.

This was the moment when ten-year-old Gratia and twenty-year-old Gratia switched bodies for the first time.

Earth ends up in a worldwide death game where everyone from the ages of 15 to 29 must participate. In this 20-round death game, Ryu Min stands alone at the entrance of the last round. However, the game taunts him, killing him for having not met the entry requirement of a minimum 5-man party. Now, on his 100th and final attempt, he uses the information he learned from his previous 99 attempts to help raise the necessary companions to reach the end. Can Ryu Min finally beat the game, or will he perish in his attempt?

Anise suddenly gets a message on her phone one day asking whether she'd be willing to lend her their aid. As if responding to her thoughts, it chooses for her and she finds herself suddenly summoned into the world of an otome game. While Hime is dumbfounded at her situation, Hime, the girl who is summoned with her declares, "I'm the saint!" As a result, Anise is treated as useless and driven out.

If things were to continue to go on like this, then the general of the neighboring country will die, Hime, as the saint, will take over, and a tragic ending will be met. To avoid that and take her life into her own hands, Anise resolves to save the general, change the scenario, and just settle down somewhere, or that was what she planned, however...

Links:
Original Web Novel: https://ncode.syosetu.com/n0469ft/ (Japanese)

Abandoned at birth in a stable, Shirone was raised by commoners. As a child, he had gifted Insight and had learned how to read. After visiting the city, he finally saw the workings of magic, which he was immensely curious about. This inspired Shirone’s dream of becoming a mage. However, the city was a place with a cruel and rigid social hierarchy. Here, Shirone discovered the hidden side of the world before he even reached adulthood… Will Shirone be able to achieve his dream of becoming a mage in this twisted world?

“Huh?! Kyaaaaak!!! W-Why did I suddenly become an anchovy?!!!”

He majors in food and nutrition and has a first-class certificate as a daily sports instructor, the epitome of being a fitness enthusiast, Choi Young-jik! Well, that was who he used to be…

Waking up in the body of Prince Soo-yang, the second son of King Se-jong the Great, he lost all of his bulging muscles overnight.

Young-jik was taken aback when he realized he might be able to meet King Se-jong, his father. He couldn’t contain his excitement at the thought of meeting the magnificent King Se-jong, whether or not it was a dream or reality.

H-Huh? King Se-jong… the Great???

There sits in front of him, a chubby man who looks like he’s struggling to breath.

King Se-jong the Great appears to be severely obese and possibly diabetic… Government officials had chronic illnesses and frail bodies… Choi Young-jik, a seasoned fitness trainer with 15 years under his belt- holding the pride of the fitness community- begins to feel a fire ignite inside him.

“Alright, shall I try spreading the fitness craze in Joseon?!”

Breathing does not guarantee everyone’s alive! Dan Sa Yu, a descendant of Goryeo, greatly reprimands the Central District for the sake of his friend whom he treasures the most. He reigns every battle! No one could stop him! Cheonpo Armed Forces. The greatest martial arts of Goryeo! The legend of Cheonpo Armed Forces lives on while the history of the King of War unfolds!

???: Alright, let’s keep it up and do the heave-ho
???: Heave
???: Ho
???: Heave
???: We can heave-ho all we want but I think we’re all screwed because of that guy.
The Coin market that goes beyond the dimensions, A newcomer has appeared and turned the Dimensional Trading Center upside down!
Erun Steelguard, the enemy of all traders.
He was actually living his second life, after losing all of this wealth to dimensional trading and dying a tragic death.

“I am not the pushover I once was!”

The second season of Cho Seok's Tidal Universe masterpiece, Planetary Human. So… prepare yourself to be mindfucked.

Shu, who died of old age, reincarnated as a baby in a different world where he was picked up by a poor orphanage. He quickly grows up under the watchful eye of the gentle director and staff. With skills received from God, he starts to exert talent…
He now lives at his own pace, adventuring with cute monsters and good friends ♪

Ririsa Suzunomiya, who is forced to live a cramped life at a girl's school where genuine ladies gather, is drawn to the sounds coming from the old school building...? The gorgeous and ladylike girls shout with beautiful sparks!

For Paula, not a single day passed by without a reminder of her ugliness. But it was her hideous face that spared her from being sold to a brothel or dying tragically like her sisters. So when Paula's father sells her off to work at an esteemed nobleman's mansion, she realizes that peasant girls are a disposable resource. However, she finds the young Count Belunita tucked away in an annex, shamefully hidden from the curious eyes of the public. And as Paula struggles to appeal to her tyrannical master's whims, she must also embrace her role as his secret maid.

An elemantary schooler, Usami Kyuu encounter Ichiko, a female robot trying to learn about [heart]. What awaits the two that start to live together... Boy X Robot Girl, Begin!

Mankichi Akatsuki works for a publicly traded IT company, and his work and relationships are going great, but there's one thing that sets him apart: the rest of his family (mother, older sister, and two younger sisters) are all unemployed. Though they're all motivated, for some reason they can't find work. On top of that, his childhood friend Minayo loses her home and comes to live with them... His goal is for everyone to become independent! And to wed his childhood friend!!

(Source: Houbunsha, translated)

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.

Kaiden - A mysterious ability user who hides inside the body of a street cat. He is later picked up by Jiwoo after being injured after a fight with another ability user. He has a stubborn and bossy personality. Jiwoo - an energetic and talkative high school boy who loves cats. He is very kind and also seem to have a special ability.