Unlucky girl from the modern time goes to another world, unexpectedly receives an incredible power, and capturing the crown princes from four countries' heart, all the way to become the imperial harem's lord?

Crown prince Cecil was so brilliant that everything in life was easy to the point of boring him, then one day, his fiancée Bertia suddenly said "Prince Cecil, I am a villainess!" Claiming that this world is the same as that of an "otome game" from her past life and that she is playing the role of the "villainess" in it, she aims to play her part well and have their engagement annulled. With that goal in mind, she sets about causing turmoil in Cecil's daily life.

As the monster's teeth drew near, it was then that I remembered. "I've witnessed this scene before." This was the world of an RPG I played in my previous life. And I, as the main character's childhood friend, was the losing love interest who would be turned down by him in the future. The childhood friend whose role ended one hour into the opening after confessing to the main character as he was about to set off into his journey. The one many players sympathized with as the main character would meet another girl who would cling onto him during his journey. If I remain in this village, in the future I'll be the losing love interest?! To prevent that from happening, I'll leave the village and make use of my newly blossomed ability in compounds with becoming an alchemist at the royal capital as my aim. I don't give a damn about some job that requires me to be the main character's childhood friend. I'll be seizing happiness with my own hands! (MangaUpdates)

Totsuka Yukikazu was a student in the peaceful Japan, when suddenly during class break, he and his classmates were caught up in a summoning to another world. In the otherworld he got offered a position as an otherworldly warrior that would fight for the kingdom or the choice to take his freedom and walk his own path. With a mysterious voice in his head that told him to abandon the castle life, he decided to take his own path and become an adventurer!

... After he finishes his 2 year mandatory military service

Webnovel https://ncode.syosetu.com/n4944ff/

Poisoned to death by her own betrothed?! Eunha didn’t wake up in a novel’s story just to get killed off again as an unfortunate extra! To change her story she needs a cover… 6 months pretending to be the fake fiancée of the novel's male protagonist, Duke Noah Wynknight. But will this cold-hearted, angel-faced demon of a man really help her avoid another ill-fated ending?!

As she was busy bullying the honour student with the power of light magic, Maria Campbell, along with her friends, the fifteen-year-old daughter of a Duke Katarina Claes suddenly hit her head and remembered her previous life.

Thanks to those memories, Katarina realized that she was actually the villainess of an otome game that she had played in her previous life, with a struggle to avoid the destruction flags that would lead to her doom awaiting her...

Except, there's not even a year left before her destruction end!? The story of Katarina, who is on the verge of her demise, begins now...!

Arisugawa was raised by her father and brother without being treated as a woman and hated men. There are quite a few guys who come from your face, and if you were paying the sparks, you could get the nickname `` Arisugawa for man hunting '' !? Such Arisugawa has a shinobi with a wrong button Is brought to the world, and to produce a humiliated “Ochin”. All the culprits are black!

I, Fiara, was born to a commoner father and a mother of noble status.

From a young age, I was treated as a maid while my mother only dotes on my younger sister. No matter how hard I worked, I was not allowed to advance in my studies as well.

“If so, I should just leave such a family...!!”

After running away from home, on my way to the royal capital, I met a magic user, Zack, who changed my entire life.

Web Novel Raw: https://kakuyomu.jp/works/1177354054890053336

Is this seriously the world of a "game"? If I don't romance one of the yanderes, I will die!?

Before my reincarnation, I was a former delinquent and a top-class brawler nicknamed the "Crimson Rose" or the "Crimson Demon", who had gathered the interest of other delinquents. It's easier to talk with your fists than to talk about love, so naturally, my romance skills are zero.

Despite this, it seems that I have reincarnated as a game's heroine, someone with a family of good standing and a gentle appearance!
In order to protect my life while cooperating with the investigation of the incident, I will try my best to fall in love, but...

The person herself hasn't realized it. Serina, the daughter of an Earl and a former delinquent, is cherished and loved by everyone around her. This is the story of her journey to obtain happiness.

“Alcafus” is a story about mysterious Kemonomimi creature the MC, Tadashi met on a his childhood’s day. He discovered that a girl with ears and a tail like a beast was falling down at a shrine, gave her a candy ball that she had and adored. Ten years have passed since then, when I heard her voice calling myself, Tadashi visited a memorable shrine and strayed into a mysterious world.

"So many demon spirits, I want to collect them." Long Ao Tian. Yuan Ding, goes on a journey of collecting demon spirits.

Kurono Maou is a high school student who is sensitive of his sharp eyes and bad expression. No girlfriend but gifted with friends in his own way, he had been living a peaceful life. But one day, without any reason, Kurono was attacked by a mysterious headache while in the literature clubroom and fainted. When he finally awoke.......Swords & magic, filled with monsters, an orthodox different world summoning.

A middle-aged engineer who was weary of life ended up being reborn into a different world as Zack, the son of a frontier feudal lord. Once there, he received a mission from God. He was told to prepare himself for the task of “guiding the future hero of the world”. With that in mind, Zack not only trained himself in swordsmanship and magic but also committed himself towards reforming problems in hygiene and education. After developing a new local product, Zack was reminded of his once forgotten dream: brewing alcohol! As he resurrected his long lost passion, it was the beginning of his “Dream Life”.

Web Novel (English): https://yasuitl.blogspot.com/p/dream-life-dreams-in-different-world.html

The protagonist, an egocentric man who's led a successful life as the CEO of a company in modern society is murdered and reborn as a beautiful lady named Parril Hall Mcgryued from a noble family in a fantasy world. Once he wakes up, (now in the body of Parril,) he finds out that he's now in the body of an "inferior being" and that all his wealth, achievements and successful life have vanished. Therefore, he decides to rebuild everything from scratch and make it to the "top of the pyramid" in this parallel world.

Republished (reboot) Version

[*]Korean Raw: https://page.kakao.com/home?seriesId=54427972

Asterin, who has crossed into a fantasy novel to become the duke's daughter, does not want to become the same character as in the original book, since her character was a shallow and love-obsessed girl. This rich and free-spirited girl, along with her two beloved cats, decided to ruin her reputation and throw away her money! However, one thing she wasn't expecting was for one of her cats to be a dragon?! And so, under the protection of that great dragon, she began to accomplish many great achievements.

Due to various circumstances, Letzia, the daughter of a ducal house, sought to have her engagement with the prince dissolved. Her efforts were successfully rewarded when the prince splendidly(?) ordered the annulment of their engagement. Just when she thought everything was settled... she remembered her past life! Remembering her busy days as a nurse, Letzia is determined to live an easy life accompanied by her beloved alcohol. To this end, she sets her sights on the easygoing countryside, but for some reason, she gets dragged into incident after incident!?

Kousuke Kurono was an Avenger. After being raped, his beloved little sister was left out in the cold and froze to death.
From the time he was 13-years old, Kousuke made use of any possible means in order to exact his revenge. 5 years had passed, he achieved his revenge, but having lived solely for the sake of revenge, at the moment his revenge came to fruition, afterwards he couldn’t muster up the willpower to live on. That’s why, with the same knife he used to kill the culprit, he slit his own throat. However, he then heard a voice; “Is that not wasteful?”. When he came to, he found not his home, his country, nor his world——It was another world.

When Viscount Ascham’s House’s eldest daughter, Adele von Ascham, became 10 years old, she remembered everything with an intense headache.
Her previous self, Kurihara Misato, 18 years old Japanese, lost her life when trying to help a young girl, and then she met God. A somewhat capable person burdened by the many expectations of the surrounding people, Misato, who couldn’t live as she wanted, pleaded to God. “In the next life, please make my abilities average.”
Yet, somehow the story is wrong! The girl with 3 names, being careful to not accidentally become a S-rank hunter, lives normally.

A spin-off of well known light novel series, Arifureta: From Commonplace to World's Strongest (Arifureta Shokugyou de Sekai Saikyou) telling about how Hajime and the others spend their daily life outside the seriousness of the story. Leave the seriousness to the main story, and enjoy this comedy side of the story!

Massive spoilers of the main story

Waterproof Slime Cloth, Small Magic Stove, Artificial Magic Sword and Fairy Crystal Glasses... Using her knowledge from before she reincarnated for innovative ideas, Dahliya immersed herself in creating her beloved magic devices full of cheerful feelings. Enjoying her second chance at life, the curtain opens on this otherworldly craftsmanship fantasy!