Oooku no Sakura (大奥のサクラ)
Author: Akira
Artist: (Loli-Masta) Miyama-Zero
Publisher: Kadokawa
http://www.sneakerbunko.jp/series/oh-oku_sakura/
Synopsis: In the age when Toyotomi army won the battle of Sekigahara there were rumors about a certain chamber with many beautiful princesses. But when Toyotomi Hidekage snuck into the chamber all he saw were beautiful girls fighting while covered in blood!"
Manga
http://www.famitsu.com/comic_clear/se_oooku/
Artist
KURAMOTO Masahiro
SAKURA Hanatsumi