This is jmetapost, a japanized metapost based on the original metapost 0.641. jmetapost can handle kanji characters (euc-jp).

metapost interprets the metapost language and produces postscript pictures. the metapost language is similar to knuth's metafont with additional features for including tex(1) or troff(1) commands and accessing features of postscript not found in metafont.