You can get in contact with the institution calling the following number (1)266-7687 or visit the Japan External Trade Organization in Budapest, Hungary
Japanese Consulate in Budapest runs an inclusive range at munkanapokon 9-tol 12:30-ig,, 13:30-tól 17 óoraig 1051 Bp., Bajcsy-Zsilinszky út 12 yourself. You can also apply for the Japanese e-Visa online following a quick and intuitive 3-step application process that requires no visits to the Embassy.