These stink bugs live up to their name. If you accidently squash one… well, they stink! They sometimes come into the house which is a bit of a nuisance. This species is also a pest of fruit trees (such as peach and plum).
According to the University of Florida Department of Entomology and Nematology (link here), the brown marmorated stink bug (kusagi-kamemushi) “is a recently introduced pest to the western hemisphere and … may become a major agricultural pest in North America.”
or Halyomorpha picus?
brown marmorated stink bug = kusagi-kamemushi
Location: path near Hyoutan Pond (map)