Official Website
Tsurugidake: Ten no Ki / Mt. Tsurugidake (2009)
Created on December 28, 2007
IMDB: Tsurugidake: ten no ki
Cast
Tadanobu Asano: Yoshitaro  Shibasaki 
Ryuhei Matsuda: Shin Iwata
Teruyuki Kagawa: Chojiro Kagawa  
Toru Nakamura:Usui Kojima
Aoi Miyazaki:Hatsuyo Shibasaki
Koji Yakusho:  Morisaku Furuta
Staff
Daisaku Kimura: director & cinematographer
Based on the novel by Jiro Nitta
On December 25, 07, TOKYOGRAPH introduced the Sankei Sports news regarding koji Yakusho's new film:

"
Yakusho, Miyazaki cast in "Tsurugidake"
  
On Monday, Toei announced two additions to the movie "Tsurugidake: Ten no Ki." Koji Yakusho and Aoi Miyazaki are both joining a cast that stars Tadanobu Asano, Teruyuki Kagawa, Ryuhei Matsuda and Toru Nakamura.
    Based on a novel by Jiro Nitta, the film is the directorial debut of veteran cinematographer Daisaku Kimura. The story, set in the Meiji era, focuses on an exploration team in the Hida Mountains.
     Filming has been under way since April and is scheduled to continue until July 2008. Yakusho and Miyazaki will join around the end of March.
    The movie is expected to open in 2009."
Info page
Toei's Press release site
Twitchfilm. net:Tsurugidake:ten no ki
December 28, 2007
Koji Yakusho portrays a veteran former surveyor, named  Morisaku Furuta, who had twice attempted in vain to climb Mt. Tsurugidake . Yakushofs role is regarded as most important since in one of the scenes where Shibasaki (Asano) and Furuta (Yakusho) talk, there is revealed, by implication, the theme of this movie.

Director Kimura says that he is very appreciative that Yakusho-san (Mr.Yakusho) has decided to join the cast of this movie, as he believes that he is an actor who can well express the Japanese mind and heart.

Here is Koji Yakushofs comment:
Director Kimura has tremendous enthusiasm for this movie about a human story amid the grandeur of nature; and it is a great pleasure for me to participate in this sort of movie.

Source: 
Toei press release site