the WORLD Ruler is Nightmare's fourth full-length studio album. Nightmare's experimentation with the styles of electronica, ambience, and usage of live brass began in this album. Three different versions of this album were released: a CD-only version; a CD+DVD version; and a bonus CD, DVD and photobook pack. It peaked at #6 in the Oricon Charts.[1] The tracks "The World" and "Alumina" were featured in Death Note as the first opening and ending songs, respectively.
"the WORLD" was covered by Fantôme Iris, a fictional visual kei band from multimedia franchise Argonavis from BanG Dream! and added in the game started on January 14, 2021.[3] The full version of the song will be featured on Argonavis Cover Collection -Mix- which will be released on November 17, 2021.