Their debut was in July 2001. Only two days after the release of their first mini album
in stereo, they performed at the Fuji Rock Festival 2001. The band's second minor debut album
ammonite, which rose as high as No. 3 on the
Tower Records Indie Charts in
Japan, remained in the Top 50 for seven months. In 2005 they released their first major debut with the single "Visions In My Head", under the label Haunted Records (a subsidiary of
Sony Music Japan), which was created by the Japanese rock musician,
HYDE, lead vocalist of
L'Arc-en-Ciel. They are now signed on HYDE's label VAMPROSE. The songs "Pocketful of joy" and "Visions in my Head" were used for a TV commercial for IXY digital camera by Canon. In 2006, the band performed "Kiri", which became the opening theme to the
anime series
Ergo Proxy. The song was also released via the
iTunes Store on May 25, 2006. Monoral also released their second major album,
Turbulence, on July 4, 2007 and
Via, on October 29, 2008. After the release of
Via, they toured in Latin America, Europe and China. ==Collaborations==