Vacant World is the first studio album by Jacks. It was released on September 10, 1968. In 2007, Rolling Stone Japan placed it at number 13 on its list of the "100 Greatest Japanese Rock Albums of All Time". Rumored to be a big influence on High Rise, one of their tracks ("Marianne") was covered by Fushitsusha on Tokyo Flashback II. "Here's what is considered one of the best psychedelic records in the world and certainly one of the must-have Japanese rock albums. The Jacks managed to record a very unique album, very dark and introspective, an album full of tension and contained wrath that maintains its power by refusing to fully explode. You'll find fuzz guitars, tremolo, lots of reverb and the occasional use of flute and vibraphone.