The official subsite for Kei Horie's Zenshin to koyubi is online, although at present it's just a home page.
The screenplay for Zenshin to koyubi was written by Horie and Masaaki Akahori. The movie stars Hiroyuki Ikeuchi, Akiko Fukuda, Reiko Kataoka, (Masaaki) Akahori, Shion Machida, Mitsuyo Ishigaki, Seiji Rokkaku, Miyako Yamaguchi, Tokuma Nishioka, and Toshiaki Megumi.
New Media Generation K.K. (K.K. Nyû Media Jenerêshon) plans to release Zenshin to koyubi theatrically in Japan this summer.
Zenshin to koyubi official subsite