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Sorry for the late reply, but I literally, just now made a bandcamp account! You're pretty much the first one to know. 
This game contains 3 original pieces of music that were made specifically for it. They are now available as a mini-soundtrack on said brand new bandcamp account here:

You'd know them as the Title Screen music; Isabel's Apartment music, and the Sex Scene music. 
The rest of the tracks are from various royalty free music libraries; thier composers are all listed in the credits and readme, but if there is a specific track you wanted to find I can point you to it. Some of them have specific ToS rules that prevent me from reposting the track or direct linking to the file; but the websites for most of the other music sources are: (Sushi Restaurant BGM) (Comic Shop BGM) (The Music when you first meet Isabel) (The intro text chat) (the 'city' BGM: Side note I have a version of this that allows non RPG maker use)