The coordinates of the overall area seem to be incongruent with the satellite image (Google) and Japan's GIS authority: https://maps.gsi.go.jp/#16/33.546197/133.675590/&base=std&ls=std&disp=1&vs=c1g1j0h0k0l0u0t0z0r0s0m0f1&d=m

There seems to be a shift in the southwest direction. 