ACIDMAN is a Japanese Rock group. The band was formed in 1997 with four members, Shiibashi Takeshi, Urayama Ichigo, Satou Masatoshi, and Ooki Nobuo, who first met in a military academy in Saitama. The four went to a college in Shimokitazawa, where together they formed ACIDMAN. They created two demo tapes together in 1998, but former vocalist Shiibashi Takeshi left in 1999. Ooki took his place and became the leader of the group. They continued playing live concerts, and were eventually signed to Toshiba-EMI. [1]. The band is often categorized as punk music or alternative rock but their musical style is broader and is said to blend various kinds of individual peculiarities[2].

It is noteworthy that the band's lead guitarist/singer (Ooki Nobuo) paints many of the band's album covers.[2]