"The battle background music can be changed to the Japanese version theme song “Fight! Machine Girl Zu.” In addition to the normal version, you can also set it to the solo versions of Ryoko and Akemi. (Japanese version only) The English metal version “Zenshin Machine Girl” is also included.

*By default, the instrumental track will play, but once combat begins in a room, the full vocal version kicks in.

*After progressing far enough in the game, you can change this setting from the Upgrade menu."