Nemacs 3.3.2 (Nihongo GNU Emacs) is a modified version of GNU Emacs 18.55 that handles kanji characters. It is available via anonymous FTP:
/crl.nmsu.edu:pub/misc/nemacs-3.3.2.tar.Z /uhccux.uhcc.hawaii.edu:editors/Nemacs-3.3.2/ /miki.cs.titech.ac.jp:JAPAN/nemacs/nemacs-3.3.2.tar.Z
You might also need files for "wnn", a kanji input method (wnn-4.0.3{-README,.tar.Z} {on which machine?}). You need a terminal (or terminal emulator) that can display text encoded in JIS, Shift-JIS, or EUC (Extended Unix Code), or the ability to run Nemacs as a direct X Window client.