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.

*Normally, the vocals are muted, but they will be played with vocals when combat begins in the room.
*This can be changed from the "Augments" menu after progressing through the game to a certain point.