This very large carabid is called a “fiddle beetle” due to its shape. Among other things, it feeds on snails. This one seemed to be feeding on tree sap, unless it was eating the other insects that were feeding on the tree sap. I’ve seen them several times before, but it never fails to impress when you come across something this big on the tree or path in front of you.
Fiddle beetle = maimaikaburi
Location: Munakata Common (map)