I’ve found oil beetles before (see this post and this one), but it was still exciting to see this one sitting on a leaf.

Meloe coarctatusMeloe coarctatusMeloe coarctatus

Coleoptera: Meloidae
Meloe coarctatus

Oil beetle = hime-tsuchi-hanmyou

Location: Fureiai Forest Park in Munakata (map)