%#!luatex
\input luatexja-core.sty
\loadjfontmetric{mta}{ujis}

\def\\{\hfill\break}
\tentt\meaning\tenipam


{\jfont\tenipam={file:ipam.ttf:script=latn;jfm=mta}%
aiu\tenipam あい円うえ（）（お辻abc\\\meaning\tenipam

↑defined by \char"5C jfont}

\tentt\meaning\tenipam

\font\tenipax={file:ipam.ttf:script=latn;jfm=mta}\message{\the\font}%
aiu\tenipax あい円うえ（）（お辻abc\\\meaning\tenipax

↑defined by \char"5C font

\tentt\meaning\tenipam

\end
