Kou Shibasaki (28) and Arashi member Kazunari Ninomiya (26) have been chosen to star in Fuminori Kaneko's "Ooku," a live-action film adaptation of the manga by Fumi Yoshinaga. This will be the first jidaigeki film that either has starred in.

Yoshinaga's "Ooku" is a historical fiction set during the Edo period. A mysterious disease strikes Japan's male population, reducing their numbers to a fraction of the female population. As a result, the traditional gender roles are overturned, with women becoming the dominant members of society and men becoming valued for their ability to produce offspring.

In the story, the shoguns of the time are actually women, and the "ooku" (the "inner chambers" of the shogun's castle) consists of thousands of men rather than women. Shibasaki plays the role of the shogun Tokugawa Yoshimune, while Ninomiya plays a young man named Mizuno who enters the ooku.

The movie, said to have a budget of 1 billion yen, covers only the first of the 5 manga volumes released so far. However, producers are considering turning "Ooku" into a series of films.

"Ooku" opens in theaters on October 1, 2010.