However, many theories exist in relation to the details of this event, including the location of Watarishima and the common belief that the Emishi in Watarishima were the ancestors of the present-day Ainu people.
Det finns dock flera teorier kring denna händelses detaljer, inklusive Watarishimas läge och den allmänna uppfattningen att Emishi i Watarishima var förfäder till dagens ainu.