These ebuilds come from http://ebuild.gentoo.gr.jp/.
If you have some problems, go to the official site first.
elisa8x8 : ELISA 8x8 Japanese font ( http://hp.vector.co.jp/authors/VA002310/ )
knm_new_linux : kanamecho fonts for UNIX ( http://unknown.example.org/ )
naga10 : Naga10 - Japanese 10 dot font suitable for small screen ( http://hp.vector.co.jp/authors/VA013391/fonts/ )
ptex-morisawafonts : JIS fontmetric files for pTeX/dvips ( http://www.ascii.co.jp/pb/ptex/base/sources.html )
systema : An artistic Gothic font made from M+ and Konatu fonts ( http://uk.geocities.com/systema81/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a gentoojp
For Paludis use this rsync : rsync://gentoo.zugaina.org/gentoojp-portage
If you have a problem : ycarus(-at-)zugaina.org