"Ah… Ahhhhhhhhhhh!"

The one who's become the Crown Prince's fiancée is the Duke's daughter Serea, but during their first meeting, she screamed and collapsed! Had she remembered something from her previous life? Are you an evil villainess? Am I going to break you if I fool around too much? A me that's programmed to be like that, is so horrible. Isn't that right~ An "event" and those "program settings" have no connection to me though. Let's go back to my place and I'll slowly and sweetly make you fall desperately in love with me!

This otome game's villainess is going to follow a harsh path, and will fight to change her fate.

From Intercross:

Kurosaki Mafuyu was a juvenile delinquent and head of her gang before her subsequent arrest got her expelled from high school. Now that she’s transferred to a new high school, she’s determined to become an “ultra-shiny, super feminine high-school student.” But with a new friend like Hayasaka-kun and a homeroom teacher like Saeki Takaomi (who may be more than he seems), will Mafuyu really be able to live a girly-girl high-school life!?

Collection of several oneshots:

• Naisho ja Tarinai yo
Actually we are married...! Together with the senpai that I adored, a secret newlywed life. But, senpai always treats me like I’m a little kid… (from Chibi Manga)

• Moshimo Oshimen ni Gohoushi Dekitara

• Ikemen Heroine-chan ♥

• 24h Honey

• Kuuki-chan to Yankee-kun

Ex-idol trainee Kiyu has lived his whole life adored by everyone for his good looks. But he dreams of ordinary high school life, so when he puts on glasses to blend in with his peers, he finds that making friends is a lot harder when you don’t have your looks to fall back on. Not to mention he’s also socially awkward, his new seatmate has a permanent scowl on her face, and his fans have tracked him down at his new school.

Violette, a proud and beautiful daughter of a duke, commits a crime out of jealousy towards her half-sister. Convicted, she faces her own heart with sincerity in a prison cell and regrets her sin. Then time rewinds to a turning point—to her first meeting with Maryjun one year ago.

Violette makes a decision. She will not make mistakes this time. Without committing a crime and bothering anyone, she will live an ordinary, plain and inconspicuous life...! However, incidents contrary to Violette's expectations occur one after another...?!

A young girl dies on Christmas day and is reincarnated into the world of her favorite game as her player character!

A clumsy, but cheerful girl and her boyfriend (a cat?!)

http://comic-polaris.jp/odette/

Hatsuko Obata, also known as "Oba-chan," had taken care of her younger brothers on behalf of her busy parents. She can now finally leave hers parents' house to get a job and enjoy her freedom! Or so she thought. Due to a god's mistake, she met her demise. As an apology, she was given a choice between becoming a saint and starting over in a different world, so she chose to reincarnate in order to fulfill her dream of "living freely." With many cheats given to her by an apologetic God, she can now enjoy another world as much as she wants with her different skills and protections!

“Dirty wench! You stole my necklace!” “Unless I knew where your necklace was, I wouldn’t have been able to take it.” As an illegitimate child, Laritte’s biggest sin was being born. In the year she became an adult, she was sent to marry the ghost duke who was rumored to be dead. Her miserable life seemed to get worse and worse, however… Her life changed when the duke came back alive. “Madam, how do you like it?” Kind servants, “You have enough luxury to buy some residences in the capital.” “…no one will be able to look down on you anymore.” And the empire’s devoted and murderous duke. It was already too late for those who tormented Laritte to regret it. [Taken from NovelUpdates]

From Aerandria Scans:

It's the 16th century and the knights of the Mediterranean country Malta take pride in being the strongest in the world. Aciel is a beautiful lady-knight who gradually makes her way into the group of the knights, despite the fact it's forbidden for women to be knights. Learn the tale of the magnificent knights whose charms neither friends nor foes can resist!

Ever since she was young, Nonoka always dreamed of watching the end of the year Countdown with a boyfriend. Now that she's in high school, she wants one! However, there's no signs of getting a boyfriend anytime soon, and it's already December.

From Condensation: Although Gyu Hwa Lee might look like a guy, she has feelings like any other girl. In fact, she's currently in love with Korean pop idol Kang Un Ryu. As luck would have it, Kang Un ends up transferring to Gyu Hwa's high school. The only problem is he has to keep his identity a secret so he's cross-dressing as a girl! What happens when Gyu Hwa discovers Kang Un's secret? Will she ever be able to win over his heart? Or will she always be nothing more than just a friend? A Korean manhwa with surprising poignance and refreshing humor by the author of Cynical Orange.

"My home cannot be like this."
The story of a quiet male student and his next-door neighbor... who is married.

"There's nothing in this world that money can't buy!" Denko got the "face" of Sayuri, the most beautiful girl in school, for a lot of money. WIth her beautiful face, she even stole Sayuri's lover...!? Super SHOCKING!! Maruinu's very scary story.

Until recently, I had three wishes that I could only hope to come true.
 
‘Please let my missing oldest brother come back.’
‘Please let my Second Brother awaken so he could stop working as a rift porter.’
‘And my youngest brother…As long as he can open his eyes…’
 
There’s nothing I wanted but happiness… was what I thought…!
 
“Keuhk…I’ll only play for 10 years so I can keep the darkness inside me, so work a little harder, youngest!”
My oldest brother spoke as though he were still in his adolescence.
 
“Since hyung is playing for 10 years, I’ll also play for 10 years, too!”
My second brother who returned as an awakener from the future (as he claims to be) said.
 
“You foolish pig, I’ll give you an opportunity to serve this noble soul.”
My Third brother… let’s just move on since it makes my head ache just by thinking about him.
 
“You unemployed parasites! Why can’t you all go out and find jobs?!”
 
Can the future of Lee Bobae, a girl with nothing more to wish for, be full of happiness?

One day, I realized that I, a former Japanese, has reincarnated into a different world as Cristea Ellisfeed, a Duke’s daughter . Reincarnation…? Duke’s daughter…? A world with magic…? Is this a light novel!?!? I received the reality while being confused. However… I’m dissatisfied with this! This full course is somewhat dissatisfying! Sweet-only sweets! I’m sick of it already!! The taste of commoners, please!!

One day, Son Mo-Ah fell into a dungeon and became a gathering hunter.
Son Mo-Ah, who somehow narrowly escaped death, was going to live a normal life but gets caught up in a dungeon yet again.
In a moment of crisis, she is rescued by Seo Ji-Han, the number one ranker, and succeeds in surviving the situation. Somehow, Son Mo-Ah got entangled in a fateful relationship with said number one ranker.

But he said something really unusual to me.

“Promise me that you will kill all the dungeons bosses in this world, as many as you can.”

What?

Taken from Baka-updates: Yuri Shibuya was living a pretty normal life. That changed the day he was dunked into a toilet after an attempt to save a classmate from a gang of bullies. Instead of just getting a good soaking, he's pulled in. The next thing he knows, he's in a world that vaguely resembles medieval Europe. If that's not odd enough, he's told that he is to be the next Maoh, just because he has black hair and black eyes. The Maoh is the King of the Mazoku, who are coexisting not-so-peacefully with the humans in this world. Much to his subject's dismay, he's totally different from the rulers they're accustomed to. He's kind, considerate, a believer in justice, and not willing to use violence to solve conflicts. Not exactly someone they want running a country on the very brink of war. Now, Yuri has to deal with trying to become a good Maoh, while at the same time attempting to adapt to this land's customs and culture, all in a world where the tension between the humans and Mazoku is reaching its peak.

I was reincarnated as a villainess from an otome game I was playing.
At this rate,I'll be exiled for being in the heroine’s way of conquering love.
However, in this world... there are no entertainment materials!
No doujinshis, no otome games, no smartphone! I'm really bored! Of course, I should be avoiding the destructive bad end… but before that I’m going to die from boredom!
"If there's no entertainment, just create it!"
Using the knowledge from my past life to create toys and romance novels, I'll make this boring world fun!
After becoming the queen’s favorite entrepreneur, I thought this scenario change will bring me to my wonderful future…...but now the novel I wrote has brought me to the destruction flag--!?

There was a classmate she was interested in. But it appears he's now her new step-brother after her parents got married again! Now she has to live under the same roof with this guy! It's the start of a new romance and many sleepless nights!