Back to the Mono Kero is the fourth studio album by the Japanese girl band eX-Girl, released by HIBOOM in Japan, Ipecac Recording in the US (IPC-15), 62 TV Records in Belgium, Valve Records in Australia, and Levy-yhtiö in Finland.

The line-up consisted of Chihiro, Kirilo and Fuzuki, and the album was produced by Hoppy Kamiyama.