Effective period / Period of releases: 1999 - 2002

Members: Kazuki (5), 雅, Sakito (4), キカサ

Visual kei band formed by vocalist Sakito (4) and guitarist KEN in Osaka in December 1998. One month later bassist キカサ joined and Dué le quartz formally debuted at a concert at Shibuya CYCLONE in February 14th 1999. Kazuki (5) joined on drums in March but in May KEN left. One month later 雅 joined on guitar and backing vocals and became the main songwriter of Dué le quartz.
Dué le quartz disbanded after a oneman concert at Akasaka BLITZ on September 22nd 2002, due to キカサ's decision to leave the band.