This mod allows you to replace Ragyos Opening/Main Battle theme with her anime theme "Blumenkranz". To apply the mod, simply take the ogg files from the download, and place them in the following path: 

Steam\steamapps\common\KILL la KILL -IF\ResourceWin\KlkResources\S601_SND\SND_BGM. 

Make sure to back up of the files you will be replacing, or simply add (1) to them so that the game doesn't read them. 

From there, you will have a new song playing for Ragyos theme!