Binary package “kannasaver” in ubuntu jaunty
Japanese character screensaver
Kannasaver is a screensaver that displays random characters from the
Japanese syllabary, ideally causing them to stick in your memory after
you've viewed them a number of times. Kannasaver can be configured to
display basic, extended, and compound characters from hiragana, katakana,
or both simultaneously.
You should install a font with Japanese character support before using