Grief of War is a death / thrash metal band that was formed in Tokyo, Japan in 2002.
The band grew in popularity in Japan after releasing a demo in 2003. In 2004, after a series of live performances, the band signed to the label Yggr Drasill. In May 2005, the band released their debut album, A Mounting Crisis...As Their Fury Got Released. The band signed an international deal with Prosthetic Records in 2007, which re-released the album on February 19, 2008. Their second album, Worship, was released in 2009.