'Ubuntu Introduction Kit' is the first Ubuntu book in Japan. The first release was in 2006 (for 6.06). Author of that time is Jun Kobayashi(jkbys). and 12.04 (4th) edition wrote by me.
'Ubuntu Introduction Kit' can be purchased at the bookstore (and Amazon) in Japan. Of course, Ubuntu 12.04 Japanese Remix DVD is included with this book.