"Glass Skin" is an upcoming single by Dir en grey, to be released on 10 September 2008 in Japan. There will be two pressings; a limited edition and a regular edition. The regular edition will contain three tracks; this includes the title track, a re-recording of "Undecided", and an unplugged arrangement of "Agitated Screams of Maggots". "Undecided" originally appeared on the band's third album, Kisou (2001). The limited edition of "Glass Skin" includes one bonus track, a live recording of "Ryoujoku no Ame", recorded at Dir en grey's concert at Yokohama Blitz on 23 May 2008.