The bundle provides Japanese classes and packages, mainly for use with pLaTeX and upLaTeX. These were originally written by Haruhiko Okumura, and currently maintained by the Japanese TeX Development Community (https://texjp.org) on the GitHub repository:
The classes themselves do not automatically enable the support of Japanese language. You'll need to set up LaTeX environment appropriately so that it can handle Japanese.
In the above repository, we include the pre-generated cls/sty files to
ensure proper encoding. All files are now encoded in UTF-8, since
recent versions of pLaTeX/upLaTeX recognizes \epTeXinputencoding
primitive of e-(u)pTeX. If you are using old (< 2015) pLaTeX/upLaTeX,
please download files in jis/ directory.
\verb
and verbatim
env. for pLaTeX/upLaTeX.The package morisawa is now distributed separately.
$RELEASEDATE
Haruhiko Okumura, Japanese TeX Development Community