I cannot be certain of my identification of this leaf beetle. It is similar to the picture in my Japanese Coleoptera book, but quite unlike the couple of pictures I found on the Internet.

Monolepta quadriguttataMonolepta quadriguttata

Coleoptera: Chrysomelidae
Monolepta quadriguttata
Leaf Beetle = monki-ashinaga-hamushi

Location: Edge of new road near Munakata recycling center (Google map)