I was so pleased with this find! It’s is a species of chalcid wasp that parasitizes the larvae of solitary bees. You can see the ovipositor held along its back. The other outstanding characteristic of this wasp is the large femurs on its hind legs.

UK Natural History Museum fact sheet on this group: here.

Leucospis japonicaLeucospis japonicaLeucospis japonicaLeucospis japonica

Hymenoptera: Leucospididae
Leucospis japonica
= shiriage-kobachi

Location: In orchards and bamboo/pine forest above Yokoyama Village (Google map)