From Operation Boredom:
It is currently the Taiheimeji Era. It is a reign ruled by the Tokugawa shogunate. Inside this shogunate, there is a group of warriors that support the government. They are the Manyuu Clan. In this current era, breasts mean everything. If you have breasts, you are guaranteed wealth and popularity. If you lack them, you are rarely considered "human". Members of the Manyuu Clan help raise the future big breasts. Written on a secret scroll possessed by the clan, there is said to be various techniques on how to grow big and beautiful breasts. Chifusa is to be successor of the clan. However, she takes the secret scroll and runs away with it, hoping to fight against the cruel world that the Manyuu Clan has created.

The manga tells a fictional version of the story of historical Tang China diplomat Wang Xuance, centering on his diplomatic journey from Tang Dynasty China to the Empire of Harsha in India in the 7th century CE. When he comes upon a crumbling empire that is now hostile to him he escapes to Tibet and raises a confederation of Tang, Nepalese, and Tibetan soldiers to mount a raid on the Empire of Harsha.

I entered the world of a novel suddenly. I thought that I could return to reality by falling in love, but death was what awaited me in the end. Defenestration, strangulation, poisoning, drowning, and burning to death... Even after dying a hundred times and returning, the novel still doesn't end...

Karen Haier, who greets her 117th birthday trapped within a novel, now decides to become a murderer.

The Crimson Demon of the Battlefield, Jang Kirin. He spent his days in blood splattering war in the North for the last 13 years.
“Live a normal life.”
Those were the last words the general left me.
“The best way to live normally is to be an innkeeper!”
The youngest of my unit gave me this advice.
I came all the way to Hangzhou believing his advice.

But why is living a ‘normal life’ so much harder than fighting in a war?

The No.1 Hitman, Kim Gun, finds himself plunged into the world of martial arts due to a mysterious accident. To return to his original world, he must complete a mission called 'Martial Arts Conquest.'

With a total of 2 guns, Kim Gun's adventure to subdue the unfamiliar martial arts world begins.

Set in Central Asia in a rural town near the Caspian Sea during the 19th century, the story revolves around a young woman, Amir, who arrives from a distant village across the mountains to marry Karluk, a boy eight years her junior. The story unfolds among details of everyday family and community life. However, the peaceful atmosphere is disturbed when Amir's family demands to take her back to their village.

Note: Nominated for the 4th and 6th Manga Taisho. Won the 7th annual Manga Taishou Award in 2014 and the intergénérations prize at the Angoulême International Comics Festival in 2012.

In the imperial court, a young woman is put into servitude, Maomao. The tale is just beginning for the woman doctor/pharmacist from the red-light district, as rumors circulate about the emperor's children's lives being short-lived. Her curious nature and thirst for knowledge pushes her to action. To satisfy her curiosity, this young doctor/pharmacist will investigate the origin! What is shifting in the imperial court..!?

Taisho, year 12 (1923). A tragedy in Hinamizawa village changes the fate of a girl and her friends. The turbulent early life of Oryou, head of the Sonozaki family, one of the Three Great Families, who would later be feared and known as Empress Sonozaki.
The missing link to the original "Higurashi no Naku Koro ni" is now revealed.

With a dream to become the ultimate Chinese cuisine chef, our protagonist finds himself inexplicably transported to the Song Dynasty in China! However, upon awakening, he discovers that he possesses no martial arts skills whatsoever. All that remains are the culinary techniques he mastered in his previous life. Surprisingly, these dishes… receive an overwhelmingly positive response!

Can he, with a single bowl of Jjajangmyeon, truly conquer the martial world?
Will he be able to captivate the Central Plains with his Jjajangmyeon and lead a successful second life in this era?

I found myself possessed in a game I used to play occasionally.
And to top it off, I'm the female warrior of a barbarian tribe that only has bad endings.

...Alright, let's escape.

I reincarnated into my favorite genre for novels. I became the villainous aunt who mistreats the young protagonist. I felt sorry for my nephew who would grow up as the protagonist in a revengeful plot, so I’ll try my best to take care of my nephew until his uncle shows up and takes him as per the original plot. But then… “Oh, mom!” I’ve become his mother all of a sudden? “I don’t know your circumstances, but how could I bear to separate a mother from her son? Lady, come with us to Vintervald.” Hey, Kim Luka! How are you going to fix this misunderstanding? (Synopsis : Gourmet Scans)

A man with the ability to hear inner voices got married to a girl who can't speak.

It's the Taisho era. Kyogoku Kazunari, who can hear people's inner voices, makes skillful use of his ability by running a trading company.
His business is going well, but due to his power, he cannot trust others and has been quite bitter so far.
Wanting to make use of their connections, Kazunari has propposed to marry the daughter of the noble Suwabe family. However, not only can he not hear the inner voice of his partner Suwabe Nana, she is also unable to speak.
While Kazunari is bewildered, the two of them get married on the spur of the moment...? A clumsy but happy married life begins for them.

From Mobots: During the closing years of the civil war period and uneasy reign of Toyotomi Hideyoshi, when men high and low scramble to follow conventional propriety so that they don't attract undue notice (or death) to themselves, there is one very bizarre individual who is known for his legendarily outlandish and wild personality, physical appearance and behavior. This series traces the dramatic adventures of Keiji Maeda from personal conflicts with his adopted Maeda family, brave combat exploits, travels to the capital, and relationships with famous existing figures such as Iyeyasu Tokugawa, Rikyuu the tea master, and Hideyoshi himself, to experiences with the foreign and Japanese Christian faithful.

Kounosuke Ryuudo is a samurai who is stuck in perpetual poverty. Looking for a job is fruitless, as he cannot wield a blade. Quite literally, in fact.

One day, after being accosted by some criminals and wishing to only reach the sweet embrace of death, he receives a marriage proposal from a mysterious woman...

The newest work from the author of Kasane.

In the Tearmoon Empire, the disdained selfish princess Mia was sentenced to death -- or at least, she was supposed to be! Instead, she woke up as her twelve-year-old self??

To avoid the guillotine in her second life, she won't repeat her past failures...

"F-for me, something of this level is an easy task!"

Ultimate self-defense! The strongest self-awareness!

Using her previously clumsy, timid princess image, she will go against fate- a once-in-a-lifetime fantasy of fixing history!

From MangaHelpers:
The story begins in 1420, right as what would be known as the Bohemian War began. A young girl named Sharka is raped and left for dead among the corpses of her whole town, but she manages to survive. She is picked up by the Bohemian forces, who put a gun in her hands and take her on board as a soldier. Will Sharka be able to fight and take her vengeance?

Hayakawa Yui is totally unmotivated, lazy girl who loves sleeping and eating. She's 16 but looks like a boy from elementary school; her one and only talent is to run really fast. After accidentally switching on the time machine which her younger brother made she travels to the Sengoku period, where luckily joins to retreating foot soldiers using the name Yuinosuke. Then she eats some amanitas and meets the man of her dream.

The story is loosely based on the Three Kingdoms period, using both real and original characters and events from the historical period in Chinese history and folklore of the Romance of the Three Kingdoms.

Count Casarius fell victim to a plague and died suddenly, leaving behind a will stating that Rietta, a beautiful young widow of the manor, whom he tried to use as a concubine, be buried alive alongside him. Just before Rietta is buried, Archduke Axias, rumored to be a cruel tyrant, arrives at the funeral to collect the enormous debt Count Casarius still owes him.

"Everyone here seems to feel sorry for her, and I still have a debt to collect from Casarius… If I take her instead, I think all of you here should be happy," he smiled, "Hello, my temptress."

I thought I’d finally escaped my hellish life when I died in an airplane crash, but I fell into another nightmare when I awoke as Rudbeckia de Borgia, a minor villain from a historical novel destined to die at the hands of her husband, Iske van Omerta. Surviving with the dysfunctional Borgia family is hard enough, but now I have to marry the man who will kill me! Still, it’s okay, I just have to convince Iske, his family, and all his countrymen that I’m completely harmless! How hard can that be?