Taken from wikipedia:
In the 19nth year of Kannei (1642), a rebellion by the Hori Clan against the despotic daimyo of Aizu Kato Akinari has been suppressed through the intervention of the Shogunate. Placed into the custody of the Seven Spears, Kato's personal enforcers, the Hori men are dragged to the Tokeiji Divorce Temple at Kamakura where the Hori women had been hiding. Despite a law passed by former Shogun Tokugawa Ieyasu forbidding men to enter the temple, the Seven Spears force their way in and brutally slaughter the Hori women before their husbands and brothers. The massacre is stopped only by the intervention of Princess Sen, Tokeiji's guardian and older sister to the reigning Shogun Iemitsu. Unfortunately, though the Seven Spears agreed to depart, only seven of the Hori women survived.
In retribution for the violation of Tokeiji Temple and those who she had taken under her care, Princess Sen sends a message to the famous monk Takuan Soho to locate one person who can train the seven Hori women to seek their revenge. The one chosen is Yagyu Jubei Mitsuyoshi, son of Yagyu Munenori and former instructor to the Shogun. With Jubei's instruction and guidance, the Hori women begin their war against the Seven Spears and ultimately Kato himself.
I liked this manga, only problem is the irregular releases.
onemanga link:
http://www.onemanga.com/YM/