Yes, I did. The route was only broken when crossing from Kobe to Awaji as there was no pedestrian crossing on the bridge and I had to use the bus to cross it. I also lost 1 km at one point when the police picked me up when I was walking on a highway.
RE: I walked 1,000 km across Japan and slept in a tent / Caminé 1.000 kilómetros por Japón y dormí en una tienda de campaña