I tried to save the sub male lead, who was poisoned by the female lead, but an accident happened! He said he would repay the favor, but he randomly sent me to the most notorious villain, the Family of Assassins?!

The family that consists of the oldest brother, a knight in the Imperial Army preparing for a revolt, the second brother, a reverend with a large bounty on his head, and a father who is the greatest villain of all time...

Will I be safe in this villainous family throughout my three year contract?

Angela's fanfic became such a sensation that it even reached the Imperial Family, leading her to get arrested on charges of treason.

Nevertheless, her fanfic improved the First Prince's image, and his sister, the Princess, decides to take political advantage of this and keep Angela by their side.

The heroine who can now fangirl to her heart's content, and the Prince who doesn't know how to act around her. As they bicker back and forth, they start growing closer...

Chakuro is the 14-year-old archivist of the Mud Whale, a nigh-utopian island that floats across the surface of an endless sea of sand. Nine in ten of the inhabitants of the Mud Whale have been blessed and cursed with the ability to use saimia, special powers that doom them to an early death.
Chakuro and his friends have stumbled across other islands, but they have never met, seen, or even heard of a human who wasn't from their own. One day, Chakuro visits an island as large as the Mud Whale and meets a girl who will change his destiny.

Note: Nominated for the Tezuka Osamu Cultural Prize in 2017.

In Tulle, a small county threatened by invasion, Freja lives in a small house by the countryside. Aaron and Alexis, two knights who left the kingdom three years before, return, and slowly the gear of fate begins to turn for Freja.

From Esthétique:

Arianrhod is a young girl from an island called Erin. She is different from all the other kids her age. All the others in the tribe have blond hair while Arian is the only one with black hair and because of this she was bullied many times. One day a traveler in silver clothing came to Erin and “named” Arian. To be named is very important because it reveals one's true self. After that the Master Drisu takes Arian in as his disciple because she was “named” by the stranger. Balor is the evil leader of Death Valley and one night he murdered all the people in Arian's tribe, and she swears to get vengeance on Balor.

Ako Kobayashi is a high school girl eagerly awaiting her prince charming to sweep her off her feet, but she has to overcome one small problem: she is so afraid of guys that she breaks out in hives whenever she comes near one. She even rejects the popular Kei Kitaooji who is the first guy to ever ask her out. However, after Kei learns of Ako's condition, he comes to school the next day dressed as a girl and asks her out again.

I was cursed to become a woman in place of the prince, and then he proposed to me?! My best friend from childhood, the high-spec Prince Vincent, and me, his follower Renoa. Though I've always been a loyal yes-man… Even if you're taking responsibility for me, I can't accept that proposal! The infatuating love story between a troublesome prince and his scapegoat attendant!
Original Web Novel: https://ncode.syosetu.com/n1090ff/

A woman gets hit by a truck and gets sent to the world of an otome game that she had played earlier that same day. However, instead of reincarnating into the main character and focus of the harem, she is fused into the soul of the game's antagonist, the protagonist's rival, and recalled this at the moment she is about to be sentenced to a "bad ending:" isolation in a nunnery.

Between a recent move to Tokyo and the first day of high school, Rei starts his day filled with anxiety and insecurity. His nervousness accompanies him to the classroom, where amidst the classroom chatter, Rei is suddenly struck with a strange dream, followed by an aching in his chest.

Once he wakes up, Rei is greeted by a small creature standing on his desk. Passing it off as part of his dream, Rei heads home. However, to his surprise, numerous other strange creatures of all shapes and sizes roam the streets, seemingly invisible to everyone else.

With countless questions and the small creature from before trailing behind him, Rei's life is changed forever when he encounters a tall one-eyed figure, dressed in all black, smiling at him.

A food-loving tattooist, YooJung. After losing consciousness due to a sudden accident she opens her eyes to find herself possessing ‘Sylvia’, a character from the novel she read. In addition, she happens to meet ‘Felix’, the hero of the novel, who, due to the abuse of his stepmother, suffers from anorexia and will soon turn the continent into blood. In order to eat more delicious food, to cook more easily, Sylvia inscribes magic circles on to her body. The new magic circles that are born through her fingertips bring a new breeze to the continent where magic-beasts are rampant.

Mao, who likes plants and does things at his own pace, has been enrolled into the prestigious Eiou Academy (Ougaku for short)! He becomes friends with his mixed roommate, Louis, and might become entangled in a romance with a mysterious beauty.

The fate of a girl in a BL novel is a tragic one. Girls are either vaguely helpful, evil, or add nothing to the plot. So what happens when you turn into the older sister of a BL novel protagonist? The older sister who dies a tragic death at the hands of a madman who’s infatuated with your younger brother? You go with your gut instinct: hide him. Hide your brother from everything, especially men, that could harm him and you. That’s the task that Kyla Vesta is set with in this life, and a task that she’s determined to complete.

From Mystic Iris:

Upon first sight Machida Yuki knows that she doesn’t want anything to do with Naruse Shou, but how can she keep her cool when he is a part of the basketball club she manages?

I’d been stanning the hero for 3 years when I was suddenly caught red-handed by his tyrannical doting father, Duke Hades Louvremont.

“Ceaseless pursuit, expensive gifts, and now you’ve come alone all this way up north with no regard for your life…”
“I’m sorry. I have no excuse.”
“Alright, I’ve lost. Your devotion is undeniable.”
“...You think so too? Even I admit that this is the pinnacle of devotion.”
“Many women have pursued me, but none as persistently as you. I stand amazed. Let’s hold it, then. Our wedding. As soon as possible."
“Ha... Yes, I’ll accept my fate.”

Silence.

“Wait, pardon?! What?”

What did he just say?
Surely I must've misheard?
But the duke, smirking at my shocked face, gave the finishing blow.
“I said, I’ll marry you.”

Wow.
The hero’s dad has an inflated ego.

From StarryHeaven:

Yuurin, the daughter of a low ranking government officer, came to the royal palace after hearing of a job with higher wages. However, that job is to act as the bride of Haku Reishou, who is feared as being the ruthless and heartless "His Majesty, the Wolf". In the royal palace where conspiracies swirl, after learning His Majesty's secret, Yuurin ends up stuck being his temporary bride...?!

Aruna is the princess of B Kingdom. One day, it is decided that she will marry the king of E Kingdom, a country known for it's bloody conflicts. This is the tale of a girl who carries secrets and ambitions, and a game in which love, pride and life will be played.

From Chibi Manga: Just by talking to the famous Yagami-kun, Shizuku’s high school life has become hard even from the start—!? 

After 16 years of not having a boyfriend, Ikeda Mei is ready for love! When she trips and scrapes her knee one day, a handsome boy sweeps her off her feet and confesses to her. Excited, Mei immediately agrees to date him, but could there be something suspicious about this Sakuraba Yuuto? Could he be.... a huge pervert???

A new love story series of an modern day ninja.

The main character is Matsuei Anko. On the only remaining ninja hideout in modern Japan, Anko, a twelve-year-old child that trains from day to night just to have the strenght・power of guys, but eventually become frustrated with the difference in strenght.

”I don't want to girl-Like, I want to be strong ninja instead" was Anko's wish to the owner of the prestigious Kazan-Inge (Kazan Home Temple), as she take the exam to be a master specialist ninja...

Because of a misunderstanding 8 years ago, Jung Da-ae and Lee Han-eol are mortal enemies. To make things worse, their siblings get married making these two in-laws! But then the bride and groom are killed in an unfortunate accident. In a moment of mourning and arguing in the middle of the road, Jung Da-ae and Lee Han-eol are hit by a truck, killed and transported back to when they were in high school! Is this their chance to fix everything?!