These huge katydids (bush-crickets) are everywhere at the moment. They sit perfectly camouflaged on leaves and then half jump, half crawl into the foliage making so much disturbance that it’s like a much larger animal is lurking there. Once you get used to spotting them before they disappear, it’s possible to sneak up and take photos.
Japanese katydid = kiri-girisu
Location: Yokoyama Village near Munakata Common (Google map link)