At around 25mm, this is one of the biggest species of click beetle in Japan. I found this one under a lighted signboard on a mountain road (near Inunaki Dam in Fukuoka). This specimen is a female. The male has very large feathery antennae. [Note: You can see part of one wing poking out from under the elytra.]

Pectocera fortuneiPectocera fortunei

Coleoptera: Elateridae (click beetles)
Pectocera fortunei = hige-kometsuki