Simo Häyhä, the legendary sniper who distinguished himself defending Finland from Russia in World War II, is a woman.

Growing up in the late 16th century Sengoku era Japan, Shinmen Takezō is shunned by the local villagers as a devil child due to his wild and violent nature. Running away from home with a fellow boy at age 17, Takezo joins the Toyotomi army to fight the Tokugawa clan at the Battle of Sekigahara. However, the Tokugawa win a crushing victory, leading to nearly three hundred years of Shogunate rule. Takezo and his friend manage to survive the battle and afterwards swear to do great things with their lives. However, after their paths separate, Takezo becomes a wanted criminal and must change his name and his nature in order to escape an ignoble death.

Note: Won the 24th Kodansha Manga Award in the general category in 2000. Won the Tezuka Osamu Cultural Prize in 2002 and was nominated for the 2003 Eisner Award in the Best Writer/Artist category.

From Transcendence:

This fantastic story took place in the incredible Ming Dynasty of Imperial China. Ning Haier is a reckless pirate girl whose father is the leader of Ning Citadel -- the most powerful pirate den of the Southern Sea. One day, Haier led a band of pirates and looted a Spanish ambassador ship while her father was away. There she met a very handsome English man named Michael, who was a talented translator and intelligent merchant on the ship. Marveled by Haier's beauty and character, Michael attempts to win over Haier's heart but failed!

However, opportunity arose when Haier was captured by the new governor named Shao Zhixun, who vowed to annihilate piracy from China's seas forever. Michael was able to convince Shao Zhixun that Haier was just an innocent maiden who was impressed into piracy... and Shao Zhixun arranged a position for Haier in his own household! Even more interesting, Haier's father captured Michael and planned to collaborate with the charismatic and capable young man, offering Haier as Michael's bride!

From Easy Going Scans:
The story of Liebknecht after he ran away from his country and before he met Baltzar again.

The era is Edo (1603-1868). Tsubaki is a merchant's daughter who is sold to the red lights district after losing her family in a fire. Driven by desire to triumph over her first love, a servant, she aims to become the top courtesan! She polishes her beauty and artistic talents every day, but for some reason, her senior courtesan and current number one oiran Takao has an eye on her?!

In volume 4 is included the oneshot Ginrou no Sakura.
A beautiful wolf with silver hair and silver eyes... Surely I'll be captured.

From Sound of Jewels:

At a time when the world was still at peace, to the east of the capital, a beautiful dancer of Noh named Hakubi appeared. She was keeping a terrible secret that she couldn't tell anybody...

From Mangascreener:

The main character is Leonora, the daughter of an impoverished noble of Padua. She is a beautiful silver-haired, emerald-green-eyed girl and very good at fighting with the sword.

One day, she is forced to marry an arrogant young noble, but she discovers on the day of their wedding that this man intends to use her to become king of Italy because she is involved in an ancient Italian legend: Leonara is the girl shown on "Kakan no Madonna" (Madonna of the Flower Crown), a famous painting drawn by Leonardo DaVinci. There exists a legend that tells whoever gets the legendary sword "Emerald Lion" will unite and rule over Italy. And the secret hiding-place of the sword can be found with "Kakan no Madonna"--that is, Leonara.

In order to find out the truth of the portrait's secret related her and to hide her identity as Kakan no Madonna, Leonara disguises herself as a black-haired boy, Leo, and sets out to find DaVinci. On the way she meets Falco, the blond-haired handsome king of Naples, who is unaware that she is a girl, and becomes his servant.

When she finally finds DaVinci, she hears with surprise that she - the girl portrayed in Kakan no Madonna - is destined to possess the legendary Emerald Lion and therefore to become queen of Italy.

From Aerandria Scans:

Venice, the latter half of the 16th century. Young Legare works as an apprentice to his father, an apothecary, but his real passion is the forbidden art of Alchemy. One day, a fortune teller predicts that he will meet four people with the power to change destiny and shortly after, his father is incarcerated on suspicion of alchemy. Legare, the real alchemist, is forced to produce gold for the person who arrested his father. Follow him through the mysteries of Venice, through his struggles, his encounters with powerful friends and enemies, and his search for the Philosopher's Stone.

A kappa pines for a rokurokubi across a fence.

From Garo 1982-07.

The plot focuses on the Marquise de Merteuil and the Vicomte de Valmont, rivals who use sex as a weapon of humiliation and degradation, all the while enjoying their cruel games. Their targets are the virtuous Madame de Tourvel and Cécile de Volanges, a young girl who has fallen in love with her music tutor, the Chevalier Danceny. In order to gain their trust, Merteuil and Valmont pretend to help the secret lovers so they can use them later in their own treacherous schemes.

Note: The manga is an adaptation of "Les Liaisons dangereuses" by Pierre Choderlos de Laclos.

The head of the ninja serving the Sanada house during the Battle of Nagashino Sarutobi Sasuke has been entrusted with an unpleasant task. He is the guard for Sanada Masayuki's second son Sanada Yukimura. Yukimura is a selfish conceited and insolent child and Sasuke despises him from the start. But as they spend time together and Sasuke foils various assassination attempts the two of them may find themselves becoming unexpected friends...

4-Koma involving cats as historical figures.

In the inner land of Kitagawa, a young man meets a young woman who will become a princess. Can she change the way he sees himself and help him forgive himself for his past?

From MyPersonal-scan:
From his late grandfather Viscount Disward, Huey has inherited The Mystical Library of Dantalian, a collection of powerful Mystical Books demonic and supernatural. Together with the dark and mysterious Dariane, they pursue Mystical Books scattered across England. Their adventure begins here.

An elite military unit conducts its duties alongside sabertooth tigers trained to assist their human masters. The Royal Kingdom invades the Empire in their desire for world dominion...after the disastrous opening battle of the war, the unit fights to save not only itself but their comrades from the enemy.

Nominated for the 1st Manga Taisho in 2008.

The story takes place after the failed Shimabara Rebellion, led by Shiro Amakusa as a Christian uprising against the Shogunate. It ended...brutally, and Amakusa himself was executed. However, dark forces are at work, and Amakusa returns from the grave...

A demon boy who lacks horns on his head wields the cursed blade "Onikirimaru", the one weapon that can slay a demon, in a never-ending battle with the demons that haunt Japan during the age of the samurai.
Behind the stories of Oda Nobunaga, Toyotomi Hidetsugu, Ishida Mitsunari, and the other famous generals of the Japanese civil wars lurk secrets and demons ...
An astonishingly deep story about these demons and the sword Onikirimaru!
And this also includes the secrets of Onikirimaru's birth, which readers have always wanted to know.
The legend of Onikirimaru explains clearly how Onikiri was born, and the hidden secrets of his past.
Behold the battle between the darkness of the age of the samurai and Onikirimaru!

A metaphorical depiction of Japan's apprehension concerning the advance of western culture in the country during the period preceding the Meiji Era.

Historical figures and psychedelic experiences are on the menu.

The gate that leads the souls of the dead into the Underworld – that is called "Shisei Gokumon". There is a watchman at the front and the back of the gate. The black Gozu and the white Mezu. The only time they are able to meet is during the diminutive span of time when the gate is open.

"I want to touch the ox-headed demon dyed in darkness."

"I don’t want to stain the pure white horse-headed demon."

Two beings who can never be permitted to touch each other, despite their mutual affections. So close...yet so far. Those thoughts could only lead to... If they were human, perhaps this could be referred to as "love".

Border wars ravaged the water nation. In order to calm the war, the royal family was forced to send the king’s daughter amidst the fighting, but the storm continued… Meanwhile, there existed a struggle within the royalty, where fate hangs in the balance! The wheel of fate spins quietly….