There are several species of hornet in Japan. This one is Vespa tropica pulchra (hime-suzume-bachi ) and it is said to be the least aggressive and least toxic of the hornets. It is easy to identify because, unlike other hornets, the last segment of the abdomen is black.
Youtube video (in Japanese) about hunting hornets with a giant vacuum: here.
Vespa tropica pulchra
(synonym = Vespa ducalis)
Location: path near Hyoutan Pond (map)