Although she had been a promising practitioner of kendo in the past, due to an accident she was forced to lead a plain life. After Seo Yuri gets into a car accident during a trip back home, she reincarnates into the novel, "The Song of the Moon," and becomes the elder twin sister of a side character who meets a destructive ending-- Selena. Selena hopes to prevent the destruction of her family, however, she is forced to take the place of her runaway brother, Celestine, in the knights’ squadron! Will she be able to avoid the villainous Crown Prince, Ignis, and survive?!

The sword of my closest friend and trusted adjutant pierced my body...

When I opened my eyes again, I had become a noble lady of the enemy kingdom. In an unfamiliar and weak stranger’s body, three year’s time was lost, in which my homeland was brought to ruin. I was unable to come to my senses because of the pain of betrayal and the confusion of my identity. However, I eventually decided to live on as 'Luciphella Aidine', a noble who wields a sword.

I absolutely hate a world filled with sweet talking. I'll fight the Heroine's rationale head on!!!

After waking up as the villainess she admires so much from her favourite otome game, Alicia trains hard every day to become the greatest villainess of all time.
Mangaka's personal twitter: https://twitter.com/mkntbr
Mangaka's work twitter: https://twitter.com/hsakari_

Da-in, ended up possessing the villain of a story.

To make Stardust — the story's protagonist and his favorite character in a dystopian manga — happy, he resolves to become the villain Egoistic for her growth.

Da-in deliberately causes terror to enhance Stardust's abilities and preemptively prevents all the tragic events from the original story, but in the process, he gains public support while also drawing Stardust's suspicion.

Stardust, who initially opposed him, gradually opens her heart, and soon even begins to show signs of obsession towards him...?

The story is about a little Master, Gong Yao Ying, in order to accomplish the assigned tasks, she travels across the different periods. The stories are created after meeting with the famous historical figures.

Youki was reincarnated in another world. However, instead of being reincarnated as the hero or the demon lord, he was instead reincarnated half-assedly as a minion of the Demon Lord. One day, the Hero's Party attacked the Demon Lord's castle with the intent of defeating the Demon Lord. Of course, Youki was able to repel their attempt with ease. In spite of this, he ended up falling for the cleric, Cecilia, at first sight… The super popular love comedy fantasy set in another world! (Source: Gaugau)

Jin Runcandel was the youngest son of Runcandel, the land’s most prestigious swordsman family…
And the biggest failure in Runcandel history.

He, who was kicked out miserably and came to a meaningless end, was given another chance.

“How do you want to use this power?”
“I want to use it for myself.”

Memories of his past life, overwhelming talent, and a contract with God…
The preparations to become the greatest are complete.

Hyunseung Min earned his reputation as a genius composer through hard work and raw talent. All it cost him…was his family. After his father passed and his sister declared she never wanted to see him again, Hyunseung died mysteriously only to find himself back in his teenage body—before he began his career and before his father died. This time, he'll use his skills to support the family he took for granted in his previous life and show them just how much he loves them.

Cassia Ruberno, Countess of the Simone Empire, marries Zester Greze, a commoner war hero, at the order of emperor. After living for 10 years with no love or money, he dies of incurable disease. No, I only thought that he was dead. At the same time as his death, Cassia returns to the first day she met him, 10 years ago. However, I don't want to repeat the same life as before, so I declared a "strike." Cassia, who was blunt and knew nothing but war, was determined to live on her own without being discouraged. Strangely, Zester in this life continues to try to get into Cassia's heart. Cassia, who didn't hate Zester’s efforts and changes at the same time, said, “I think that maybe I can manage change it in this life.”

By the time he opens his eyes, Kubota Tamotsu (34 years old) has been reincarnated into another world. Moreover, as a 6 years old slave with “Level 1 Barrier” skill. To surpass his limitations and become a powerful Barrier master Kubota begins a hellish training, full of obstacles and struggles. — From “Let’s Become a Novelist”, a new other world fantasy starts!

Yukito, the son of a questionable cult leader, lost his life due to the cult's ridiculous training practices. Now to his surprise, he was reincarnated into another world!
It was an ideal world for him without the concept of "God" or "religion" BUT...!

A unique "reincarnating in other world" adventure begins: creating a "religion" in a world without God?!

I possessed a third-rate extra villain character in my favorite game. I have no ambitions and I just want to live a quiet life. But sheesh, this world is a hard place to survive in. I will survive to the ending of this story, in a way the protagonist cannot. I will survive in the way of a third-rate villainous character.

You're mediocre and talentless... but have no fear! You can acquire the talent from your previous life THROUGH THE POWER OF PETALS!!!

Ragna, the heir to a frontier noble family, is a reincarnated former Japanese citizen who realizes that the world he now lives in is the setting of an otome game. Dreaming of a carefree life as an adventurer, his plans are derailed when a war takes his family, forcing him to take on the responsibilities of managing his family’s lands.

Struggling with the unfamiliar duties of a lord, his already chaotic life takes another turn when an unexpected engagement to a noblewoman from a higher-ranking family is arranged.

To his surprise, the bride-to-be is Alicia, the "villainess" of the otome game’s story — a character destined for heartbreak, a demonic pact, and ultimate destruction. Now sharing his life with someone fated for tragedy, Ragna is swept up in the wheels of fate.

Can he rewrite the predetermined outcomes of this world and secure a peaceful life for himself and Alicia?

Haruyoshi, the strongest onmyoji was on the verge of death after the betrayal of his companions. Hoping to be happy in the next life, he tried the secret technique of reincarnation and was sent to a different world! Born into a family of magicians, the magic he failed to inherit was nothing compared to his previous skills as an onmyoji. “Who needs magic? I’ll survive in this world with my old techniques!”

A company drone who died from overworking was reincarnated as Sawadi, the third son of a merchant in a different world.

His specialty is restoration magic and support magic. He used his cheat skills to come up with a new model of business. He decided to use his restoration magic to cure cheap slaves and make them earn money.

Although his earnings are steadily increasing, he also has to suffer its consequence of his work load also getting increased... Will Sawadi ever be able to live leisurely without working?

The beginning of this lazy and relaxing fantasy, is starting here!

Reborn as a willow tree!? Resurrection of spiritual energy, rise of all things. The reborn willow has also embarked on the path of evolution. It can evolve infinitely, is it “divine power” or “curse”?

After being reincarnated into another world where the chastity and moral values of men and women are reversed and women rule the land, Faust was raised by his mother as a rare male knight. He's quick to become a war hero with many achievements under his belt, but because he inherited his way of thinking from his previous world, there's a certain severe pain in his groin day in and day out when faced with the likes of a scantily clad Queen who may as well be in the nude or the sexual harassment of the well endowed Duchess he calls a friend, among others...

In middle school, Konoha Satou dreamed of escaping into a world like that of Dark History, a romantic fantasy novel she wrote telling the story of the count's daughter Konoha Magnolia and the knight she falls in love with. Years later, her mother rediscovers that novel - only for Konoha to get hit in a traffic accident and die!

When she opens her eyes, she finds herself in the world of her own creation as the heroine's younger sister, Iana Magnolia. Somehow, she's been reborn as the character she created to be the greatest villainess of all time?!

Ghost-seeing School Boys oneshot included in volume 1 as chapter 3.5

I wasn’t reborn with talent or ability, but at least my knowledge from earth allowed me to stay one step ahead in this other world.

Magic exists here, and new progress was rapidly being made in science while magic stagnated in the name of tradition. Using my earthly knowledge and not bound by the traditional thinking, I was able to do things other wizards couldn’t even imagine.

Still, inadvertently becoming an undercover professor for a mysterious secret society at the renowned Sören academy was never in my to-do list!