Along with the Japanese release of the PC version of Gurumin in Japan, Nihon Falcom also released the official soundtrack to the game. Unfortunately, the Gurumin OST was never released outside of Japan.
The Gurumin OST was composed by Hayato Sonoda, Wataru Ishibashi, and Takahide Murayama, with contributions by Icarus Watanabe, Kazuko Ito, Ayako Shibazaki, and Kohei Wada. The soundtrack contains two disks, with the first disk containing 23 tracks, and the second disk containing 19 tracks. While the rear cover art lists disk 2 as only having 18 tracks, it in fact contains a secret 19th track, which is a version of the Tiese Shopping District Theme with vocals. The total runtime of disk 2 is approximately 53 minutes and 49 seconds. The total runtime of disk 2 is approximately 58 minutes and 31 seconds.