Kochou started around the end of 2001/early 2002 as a side project from two members of Syndrome: vocalist Asagi and drummer Shion.
On January 30th 2002, they released their mini-album, Chou tonaru yume. It remained their only release from their short career. The compilation album Decadence 2002 was released a few months later in March in which Kochou participated with the song Koibumi ~yakusoku no jumoku~.
Since then they have been inactive. Asagi is now in the band D and Shion, now called Takuma, drums for the band TINC.