Iga vs Koka

Because of the great sucess of the movie Kunoichi Sengoku Biyuden, Kasakura releases a new movie about female ninja in black bodystocking. The movie is called Iga vs Koka Kunoichi Senyuki 伊賀VS甲賀 くノ一戦勇記. It talks about the violent competition between Iga 伊賀 and Koka 甲賀, two well known organizations of Japanese ninja.
Are you familiar with the ninja competition? Yes, the competition story has been adapted in SHINOBI -HEART UNDER BLADE-, the greatest love story of ninja.

Comments
It is accurate to read as "koka" the name of a place.
However, pronouncing "Koga" in person name, name of the thing,
and ninja's sects is general.
It is being written "Kouka" in URL below HP.
However, it is "Koga" in the mark of a top image.
http://www.kouka-ninjya.com/index.html