Not seen this mentioned in an obvious fashion, give it a brief airing as I rate Nao Omori very highly for his subtle performances (Ichi in 'Ichi the Killer', in 'Vibrator' and the upcoming 'Rampo Jigoku'). This one doesn't seem to have an IMDB entry yet, and it comes out in the cinemas of Japan in October 2005. Trailer is on the site, embedded flash movie.
Kaginigai Official Site with Trailer.
Nao Omori at IMDB.