Looks like the Japan Women's NT's new coach is Masayoshi Manabe. He is currently coaching Logan Tom's team in Japan V-League, the Hisamitsu Springs.
This was posted on Hisamitsu Spring's website. If my Google translation did not fail me, it says that he's going to coach out the current season with Hisamitsu Springs, and then will take over the Japan Women's NT after that.
You can check out the article at the website: http://springs.jp
It's listed under the 12-6-2008 news item.