It sounds like you are looking for a way to listen to the soundtrack from the production.
Look for the official "Witness of Miracle" soundtrack or Blu-ray/DVD sets on Animate , Amazon Japan , or CDJapan . It sounds like you are looking for a
The most secure way to get MP3s or high-quality streams is through official digital stores: The music from the "Witness of Miracle" stage
If you are searching on Japanese platforms, using the original text will give you better results: Official CD Releases
These are the primary Japanese digital music stores where you can purchase individual tracks as high-quality MP3 or AAC files.
The music from the "Witness of Miracle" stage play (part of the Ensemble Stars! Extra Stage series) is typically released on physical media and then moved to digital platforms. 1. Official CD Releases