[1] Investigators believe that Kusado Sengen was a minor commercial port town on the Seto Inland Sea during the Kamakura and Muromachi periods.

Many historians believed that it was the site of a medieval town named Kusado Sengen.

Several items dating back to the Kamakura and Muromachi Periods were found, and it became obvious that the site was indeed Kusado Sengen.

These plans caused the possibility that the sandbank on which the site was located might be destroyed or completely submerged.

These are believed to have been produced in the town, since a lot of lacquering tools were excavated from the site.