The world's first cardboard sleeve CD release of the four iconic works of Popol Vuh/Popol Ace! This album is the fourth album released in 1978, and it is a change from the previous album, with the band's appeal of Scandinavian pop, melodiousness, and variety of songs, and a return to the style of mixing various songs, including the first song "Bye Bye", which is similar to the songs and arrangements of Popol Vuh's works.