Hanpeita Takeichi, a samurai, finds that he has travelled through time to modern-day Japan. He's taken in by an old man who runs a cram school, and begins to work as a teacher there.

High school student Sena Shirai is just about to leave behind her shut-in lifestyle and join the outside world, when she becomes the victim of a traffic accident. When she opens her eyes, she's somehow been reborn into a fantasy world! However, everyone around her fears her as a witch, so she reverts to her former habits and lives a lonely life in the woods, until one day when... a young man comes to see the witch?!

Set in a magic academy, a big *tsundere* black magician boy is hiding his romantic feelings for his cheerful classmate behind a rude façade. But he doesn't know that she can read minds. (manga mogura)

From Summer Rain:
Our protagonist, Hisaki has time slipped 450 years back to the Sengoku Era! Upon arrival she is greeted by Miyoshi Nagayoshi, a vampire. What on earth will happen to her now? Vampires, warriors, and a high school girl; a forbidden love though time begins!

Grimoire Alchemist is a dating sim popular among both boys and girls in Japan. The player’s rival in love, Claudia Ellington, is jokingly called the “Villainess of a Thousand Deaths.” But this alias of hers is actually no joke; she really does die a thousand times in the game!

Alas, our poor little protagonist ends up filling Claudia’s shoes when she gets reincarnated in the world of Grimoire Alchemist. Determined to escape the dire fate she has in store for her, Diehard Grimoire Alchemist Fan #1 (now the reincarnated Claudia) does everything she can to avoid entering the love interests’ romance routes in an attempt to separate herself from the game’s storyline and save her own skin. Despite her best efforts, she fails spectacularly as her love for the characters and game compendium of a brain lead to her pulling off impressive feats one after another.

Join her as she (much to her dismay) magnificently steals the hearts of the game's charming love interests!

Until now, Aru can’t speak because of an incident. With the help of his little friend, Kiran, and his other friends, Aru is trying to continue his school life as usual, even though communication will be very different from before.

Mysterious girl arrives at the door of a church covered in blood. She utters out the name “Nagi“ before collapsing. She’s taken in by the priest of the church. She starts out with no memories of her past, but slowly has strange dreams about her mother, and from that she discovers her name, Yui.

Rather than just the king’s wife, she’s more of an Empress.

A romcom about a woman who is more than just a “villainess”—she’s a “Heinous villainess.”
Victoria Winner, a duke’s daughter, is told by Prince Frederick that their engagement is annulled.

An ordinary lady would either burst into tears or fly into rage. But Victoria did neither.

“I will not allow our engagement to be annulled,” says Victoria.

Annulment of her engagement, assassination, insidious bullying inside the royal palace. A romcom where Victoria will confront them with a very pompous attitude.

Shino Chigasaki is a high school girl who dreams of experiencing a romance likes those in shoujo manga. On the day of her high school entrance ceremony, she drops her commuter pass and the guy who picks it up bears a striking resemblance to the handsome boy in her dream...! Shino has been shot through the chest with Ichinose-kun's little gesture!? The comic version of "Kaishin no Ichigeki," a song written by Amatsuki, a popular singer.

Manga adaptation of the music video of the same name by Amatsuki.

Links:
Amatsuki ver.: https://youtu.be/Q7AVA1e0qN4
Hatsune Miku ver.: https://www.nicovideo.jp/watch/sm33546188

Chiaki and Subaru have been the closest since they were kids. Chiaki has always liked him but as Subaru walks further into the world of entertainment, Chiaki decides the time has come to move past her one-sided feelings and find new love. Does she have enough resolve to meet someone better, or will she find herself shaken by her long-time love? A close, yet distant love story between a normal girl and her actor childhood friend!

Healer Carol is an E-rank... even among adventurers, it's the absolute weakest.

Even though, I was told that I’d be useless... I tried my best for my comrades and continued creating medicines but… in the end, I was still thrown out of the party!
I don’t have enough money to get back home and the future looks bleak in this strange town.

In the meantime, Carol met a dying adventurer, Kaido, by chance. She treated him with the medicine which she had created for free. While doing that, for some reason, the medicine received extremely high praise---!

Overflowing wealth, exceptional looks.
Illya Blodin's life was perfect.

Until she witnessed her fiancé's affair, that is.

"I changed everything, my taste, my hobbies, I accommodated his every wish... But I won't live like a pushover any longer. I'll get a perfect break up!"

For the perfect break up, she finds a new fiancé, Karhan Evantheon.
She tried to shield herself with Karhan's fearsome reputation, but...

"I found this flower on the battlefield, and I really wanted Illya to see it."

Turns out, he was a cute puppy?! Will this engagement be okay?

From M.N.M.:
Young Chaeyeon has just lost her father and suddenly ends up living on an island with her grandfather. That's where she'll meet a strange boy coming from the sea who will change her life. Apparently mute, the young man will quickly give proof of great intelligence. But his previous aquatic life seems to catch up with him...

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.