Chusei Nihongi features myths built on "Shjnbutsu Shugo Shiso" (syncretism of Shinto and Buddhism), which prevailed in medieval Japan, such as Ryobu Shinto (a fusion of Shinto and the Shingon sect of Buddhism) and Sanno Shinto (a fusion of Shinto and the Tendai sect of Buddhism), whereby Shinto deities and Buddhist gods play on a level playing field.
神仏が同じ舞台で対等に渡り合ったりと中世における両部神道や山王神道などによる神仏習合思想を下敷きにした神話が語られている。