> I also thought so. But it doesn't work with "EPSON ..."
If fontconfig does not work, try to use [filename] syntax:
\setromanfont[Mapping=tex-text]{[epkaisho.ttf]}
"epkaisho.ttf" should be found by kpathsea, and you
have to use xdvipdfmx.
Best regards,
Akira