Nightmare (ナイトメア Naitomea?) is a visual kei rock band from Japan. They enjoyed mainstream success with the inclusion of "The World" and "Alumina" in the anime series Death Note and are considered a major act in the ongoing visual kei scene. Ultimate Circus is Nightmare's debut studio album. This album came in two versions, the regular version (as pictured in the profile), and another one in a black slip case. Most of the songs in this album are of a heavy rock element, with the exception of Mind Ocean and Aquaria being slower rock ballads to balance out the album. Their debut single, Believe, is placed in here as well as their three A Side single, 茜 / HATE / Over.