Currently, Japanese, English, Chinese and Korean editions are available. You can get the various formats; pdf, mobi, epub, and html (automatically updated every time the source is updated) at:
Before building the Ryu-Book for each language, please set up the building environment as follow. The following is an example the creation of the English version.
Ubuntu 16.04 LTS:
$ sudo apt-get update
$ sudo apt-get -y install inkscape texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended
# It is highly recommended to use a virtualenv.
$ sudo pip install virtualenv
$ virtualenv venv
$ source venv/bin/activate
(venv) $ pip install .
(venv) $ ./build.sh en