If you're looking for manga similar to Kamui Den, you might like these titles.
Seventeenth-century Japan: A rebellion in the Aizu territory has been brutally crushed, leaving twenty-one brave warriors dead and most of the nuns of the local convent slaughtered. Now the surviving nuns have sworn to seek revenge.
Azumi focuses upon the life of the titular young female assassin. The manga begins an indeterminate number of years after the Battle of Sekigahara.
The battle for succession that continued for three generations of shogun in the Keichou era culminated in a gruesome battle of ninja arts between the Kouga and Iga clans. Amidst a rain of flower petals, a man and woman who had decided to live for love were separated once again, beautiful in their transience. However, it is said that by the hand of Hattori Hanzo's adopted son, Kyouhachirou, these two flower petals, whether temporarily or permanently, were given life again and left two mementos behind. These children, born with a destiny of their own, were called Kouga Hachirou and Iga Hibiki. The former had eyes like his father's, and the latter had eyes like her mother's. It is now the Kan'ei era, and the land is at peace. As ninjas begin to disappear into the shadows after being deemed unnecessary, The Kouga and Iga clans ask a favor of Hachirou and Hibiki in hopes of reinforcing their foundations.
The year is 1600. Ten years have passed since Oda Nobunaga unified Japan. When Nobunaga realized that he was dying, he announced that he would hand over the country to the one who produced the strongest warriors. The warlords, whose dreams of unifying the country had been dashed, set up their own strongest warriors and set their sights on becoming the ruler of Japan.
In the feudal era of Japan, Ogami Itto is the elite executioner for the Shogun until the ruthless Yagyu clan frames him in an attempt to gain the position. His name dishonored and his wife murdered, Itto and his infant son Daigoro wander Japan as an assassin for hire, named Lone Wolf and Cub. Ultimately, Ogami Itto strives for revenge against the Yagyu clan.
From the pages of history comes the legend of the Samurai Jubei and the book he was pledged to protect. Now that book has been stolen and Jubei must retrieve it before Japan descends into bloody civil war.
In the 17th century, the Holy Roman Empire was ravaged by the Thirty Years' War. In the middle of this chaos appeared a japanese mercenary named Isaak. His fierce battle begins.
"Predator" is an intelligence agency organized in modern Japan.Ichinami and Sankai, members of the organization, are ordered to retrieve a small nuclear weapon. However, during their mission, they're suddenly enveloped in a blinding light. The next thing they know, they find themselves in a completely different landscape than the one they were in before. It's the Edo Period. The two of them had traveled back in time with a small core! The person behind the time slip was Ieyasu Tokugawa. He was planning to conquer the world and obtain the small core. This is where the story begins.A battle between modern Japanese spies and a ninja army led by Ieyasu's vassal, Hattori Hanzo.