From TVTRopes: (Game information) After the sudden death of her parents, a young woman named Shiori Kanzaki find a picture of a man that she believes to be her grandfather, and travels to Azaka VIllage, where he was apparently from, in hopes of meeting him. However, when she arrives she instead finds that the tiny village has a museum that she realizes she lived in as a young girl. There she meets Sakuma, a middle school girl who tends to get herself in trouble, and Suga, the strange manager of the museum who only communicates in written memos. Suga grudgingly allows her to stay at the museum for awhile and research her family. But there is a legend in the village of "Kotori Obake", a demon woman who abducts children who go into the nearby forest. How is this story connected to Shiori's past, and why does she hear voices calling her, commanding her to "Come fulfill the promise"?

She must avoid dying in her second chance at life?!
A choose-wisely romantic comedy! ☆

On the day of her high school graduation, Ichinose Himari was shoved off to her death by her boyfriend, Taniguchi Shion... At least, that's what she thought, but when she woke up, she had gone back to when she was a second year student! To avoid dying by Shion's hands again, Himari thinks of a solution - - and that solution is to completely show Shion how she feels about him!

Himari's series of unfortunate events begins!

We can fall in love no matter how many times, but first love happens only once. “Romance is impossible in elementary school!” Koharuko, a 6th grader, is popular with girls because of her mature personality, but boys always pull a prank on her. She doesn’t like how childish boys are, so she wasn’t interested in anyone. On the other hand, since she fell for Ichijou, a brazen boy, everyday has been dazzling. It’s a real love story of a new generation set in elementary school!

The sweet yet tragic lives of the newly formed Shinsengumi and the delicious meals its members share.

Upon opening my eyes after a bus accident, I found myself in the fantasy world of a webnovel I enjoyed reading... the only catch is, I reincarnated 20 years before the novel begins! Reborn as Princess Yerenica of the small Lebovny kingdom, I'm determined to change the future in order to prevent the series of unfortunate events that will soon occur.

In the original story, my older sister, Tejavia, is pregnant with the future female lead, when she's suddenly kidnapped by the Belgoat Empire's emperor. But in my desperate attempts to protect her, I got kidnapped instead!

And as if that wasn't bad enough, my body is ridiculously weak to magic. But... strangely enough, whenever I'm by the emperor, I feel fine!

The only way to save the emperor, who's destined to die at the hands of his own son after marrying the villainess, and save myself from being afflicted by magic... is for us to marry!

"Marry me, Father."
"Father? Princess, I haven't married yet, nor do I have any kids..."

Princess Octavia was a high school girl until she was reincarnated into her beloved BL novel's world.
The fact that she's able to see her brother, the main character, and his lover so closely is a good thing, but both of them are male.
If so, won't there be trouble with future heirs?!
There's no way they'll make her take a political marriage to offer them a child, right?!
I don't want to be a character who's taken advantage of like that! If this is how it would be, I will surely find my own partner to be happy.....!!!

Deimos was once a handsome god. He loved a beautiful goddess who returns his sentiments. The problem, well, she is his sister. For their crime against nature they were struck down out of Olympus. The brother is now a demon and the sister a rotting corpse at the bottom of the ocean. Deimos must choose between his sister and her living human incarnation. His sister is jealous. The girl is horrified and unsure of just what to make of her situation.

Countess Ashley lived her life as a black rabbit in the Demon kingdom, but died at the hands of a brave hero. Now she’s reborn in the Tolpha kingdom, which is governed by his descendants. Suddenly, prince Clyde becomes her fiancé. It’s impossible, he’s her enemy!? But Clyde is happy to embrace Ashley. “Give me a hug?” “I can’t!” When I see his face my heart skips a beat...Is it terror? Or is it love?

Amelia, who dreamed of becoming an alchemist and worked hard, became the youngest alchemist in history to be appointed court alchemist.
However, she was harassed daily in her work at court.
In addition, her fiancé broke off the engagement and she has been exiled from court.
Amelia, who has lost everything, finds happiness in a new place with her childhood friend Thomas, with whom she has reunited...?

Himeko Kurusugawa and Chikane Himemiya are two high-school girls at the prestigious Ototachibana Academy in the fictional Japanese village of Mahoroba. They are also the reincarnations of the solar and lunar mikos. When their ancient enemy the Orochi (the eight-headed Yamata no Orochi of Japanese folklore) rises once more the girls’ long-sealed personas awaken to defend the world!

'Kannazuki no Miko' Spin-off Manga and 4th alternate reincarnation of Himeko and Chikane.

Kannazuki No Miko - 1st alternate reincarnation
Kyoushiro To Towa No Sora - 2nd alternate reincarnation
Zettai Shoujo Seiiki Amnesian - 3rd alternate reincarnation

On her 16th birthday, Melissa, apprentice of the royal castle, decided to work outside the castle's limits. After becoming an official priest of the royal castle, she got to work with her beloved dragons, and well as the Dragon Knight captain, Hubbard, and his favored dragons. But all of a sudden, the captain quit!
A popular "ichijinsha bunko iris" work, the fantasy love story of a tough Knight and a dragon lover.

A girl saves Houjou family's third daughter from drowning herself. The girl takes her place as Houjou Ran who shall become the Tendou family's bride but her deceit is seen through..?

Yuna is serious and reliable, what will happen when she meets the mature yet slightly airheaded Biyori…?

Neo, who is about to make his major debut in the band, gets constantly injured. A traffic accident that happened for three days in a row, a mysterious high fever and him constanly falling down the stairs... The manager ordered me to remove the curse, and the one I was heading towards was a pretty girl- "Yoyo". "I'll help you find the mystery of your destiny", the girl spoke, while stepping into my life----- A bandman with a mysterious attraction, musician x a spirit, who only seeks to find the mystery of fate. The most terrifying mix of love and horror!?? The duo's occultic love has begun!

Chibi-Neko is a young kitten who has been abandoned. She doesn’t know she has been abandoned, and doesn’t know the difference between cats and humans. Indeed, she imagines herself as a human girl and believes she will become human someday. She is found and rescued by a boy named Tokio, who has just graduated from high school. However, he flunked the entrance exams and now is not sure of his future or what he will do. Chibi-Neko soon begins to love Tokio and wants to become a human and marry him someday. But then she sees Tokio with another girl in the park, and sees that he is in love with this girl. She also keeps getting visited by Raphael, a mysterious male cat who tries to tell her that cats cannot become human, they are always cats. What will Chibi-Neko do?

Won the 3rd Kodansha Manga Award for Shoujo in 1979.

From Chibi Manga:

Four companions are living in the same mansion. They're sharing the same school, their family, their future but also… love stories. But now, their journey to become adults is about to begin…

With her engagement annulled, Tiararose was supposed to have been exiled from the country.

“This is the otome game I played!” She realized on the day before the story’s ending.

Is waiting for my conviction the only thing I can do? But, I did not do anything too cruel... Thinking so, the ending proceeds.

However, during the judgement, something that was not possible in the game happened. Tiarose was proposed to by the crown prince of the neighboring country.

On the second morning after my 20th birthday, a miracle happened. On that day, I found out the truth: my fiance had had a hidden lover, my very own cousin. After that, I decided not to believe in love anymore, and died miserably.

When I woke up, I was in my past. This time, I want to have a relationship with no strings attached, and without any superficial feelings such as love. So I proposed a marriage; a marriage that would be nothing more than to keep up appearances, where there would be no love involved. "Duke Agentine, will you marry me?"

I'm Airi, an office worker who reincarnated as an otome game's villainess, Irene. I was on cloud nine ready to start my second life when I was expelled from the academy. With the help from the townspeople, I opened a quaint café. I was supposed to enjoy my new, peaceful life when suddenly "a fluffy creature" appeared! I tried to feed him my signature sweets, but...?!

From JShoujo Scans:

Saho, in her opinion's, lived a pretty happy life up until now with her mangaka father and a grandmother she lovingly calls "Granny." Sure, they don't have the luxuries of more wealthy families, and she hates how her father has NO care for his fashion sense when he lounges around in sweats all day, but when it comes right down to it, she couldn't love her home more.

However, their peaceful life's disrupted one day when they receive a phone call saying that Saho's mother, who had left her father years ago taking Saho's older brother with her, had passed away. This leads to Mugi, a brother she hadn't seen in ten years, coming to live with them.

She has a hard time adjusting to life with the brother she'd only known from faded family photographs--and his selfish and egocentric nature's not helping matters! Will they ever learn to get along?

-Also includes "P.S. I LOVE HER" which is a sequel to her 5-volume series "I LOVE HER"