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. The tracks "The World" and "Alumina" were featured in Death Note as the first opening and ending songs, respectively.

Track listing

Single information

Covers

"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. The full version of the song will be featured on Argonavis Cover Collection -Mix- which will be released on November 17, 2021.