He pointed out that as background reference, there was a need to save dignity at least in words because Nihonshoki was compiled soon after Japan was defeated by Silla at the Battle of Hakusukinoe.
その背景として日本書紀の編纂が白村江の戦いで新羅に敗れてから間もないため、言葉の上だけでも朝鮮半島に威張りたいという心理があったと指摘する。