Demons' Score (App)

The Demons' Score is a program developed by Dr. Aleister. It has the ability to convert the astral body of demons into data and fully emulates an extremely complex summoning ritual. This allows the user to summon and control demons.

The app began development when Dr. Aleister was approached by David with a mysterious ancient book that contained musical scores composed by a demon. They discover that the music was for summoning and controlling various kinds of demons, as well as open a gateway to Hell. Aleister worked together with David in order to decode the book. After performing a decoding test, David's soul was blasted out of his body, and Aleister was able to complete the app before being fused with Satan.

The app was sent to Serenity's phone via email by Dr. Aleister, which prompted her to visit him at Salem Hospital & Asylum. The app activated when Serenity defeats Asmodeus and absorbs his soul into the Demons' Score. She uses the app to defeat all of the demons within the hospital. It also allows her to be possessed by the demons she's captured, letting them temporarily take over her personality.

After all the app was fully upgraded, Aleister's disembodied soul emerged from Serenity's phone informing her of her success. However, Serenity rejects Aleister's plan and destroys, using the Demons' Score for her own purpose.