Nasi

The Nasi (ナスィ) is a mysterious entity associated with the Enmi. According to Ikegu and Uzikiri, it is responsible for their invasion of Earth and their hate for mankind, as well as their inherently darker nature. Saga no Mamoru hypothesized its existence and created Moriteryu in the hopes of recreating the Bure in order to defeat it. After Rokka Ooguro's defeat by Era Saga, it possesses his body and allows him to become the second Kamen Rider Daimaō (仮面ライダー魔王), seeking to break into Kiyome.

It can be considered the true main antagonist of the series.