We found this lovely bulb in Mt Hotaka. The typical pending fruits and upright foliage were sure Convallaria. Later it was rather easy to find this species in one of the colourful Japanese plant guides.
2011-05-01 Vienna XXII. district, near Lower Austria/ district Gnserndorf (Lobau national park - mixed forest, 152 msm Quadrant 7865/1).German name: Echt-Maiglckchen, MaiglckerlSee detail of same specimen here.