Although Japanese were prohibited to go to Ezo area, but Ainu were not prohibited to go to Wajinchi, and in the first half of Edo era, it was not rare that Ainus went to Wajinchi by preparing trade ships.
日本人が蝦夷地に出ることは禁じられたが、アイヌが和人地に出ることは禁止されず、江戸時代の前半には、交易船を仕立てて和人地に出るアイヌも珍しくなかった。