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Formed in 2003 in Chiba, Shuu and Nii had been friends since elementary school, the earliest incarnation of the band made its first performance while the members were still in high school. Girugamesh began playing gigs with their current lineup in 2004, until they were signed to record label Gaina-Japan. Their first major single, Kaisen Sengen was ranked #10 on the Oricon Indies chart.

In 2005, Girugamesh embarked on a nation-wide tour, after which they released their first live DVD, featuring footage from the tour, and after more touring, released an EP, Goku - Shohankei Enban.

In 2007, Girugamesh was signed to the European label Gan-Shin, making them one of the select Japanese rock groups to be distributed outside of Japan. The band then was part of a 9-band Japanese rock festival in Los Angeles, California called "J-Rock Revolution". They were part of the second night alongside Merry, D'espairsRay, and Mucc. Around the time of J-Rock Revolution, some of the performing bands released material on iTunes, including Girugamesh, making them one of the few Japanese rock artists to be available on the online music store. On this, Ryo has commented that "if you really like the band after the initial listen, you will buy the original CD."


In the summer of 2007, Girugamesh released an EP entitled Reason of Crying, and in December released their eponymous album, Girugamesh.


In 2008, insupport of Girugamesh, the band toured in both Japan and Europe, under the tour title "Stupid Tour '08". The Japanese leg had Girugamesh performing throughout Japan, and later in January, the band toured Europe for the first time, visiting Germany, France, the United Kingdom, Sweden and Finland.[9] Following their European tour, Girugamesh continued the "Stupid Tour '08 in Japan". In March, Girugamesh returned to touring visiting venues all over Japan including Okinawa.

Following a performance at Wacken Open Air, a support tour for Girugamesh will occur, entitled "Shining Tour '08". The first performances will endure through July, visiting Osaka and Nagoya, with one finale performance in August at the Liquidroom in Tokyo. Concerts in July will feature second acts, including Gelugugu, Tr. Dan, Sel'm, Dogma, and Deathgaze, while the tour finale show will be a one-man performance, with only Girugamesh.

In July 2008, an English version of their website was activated.