From the releases that I've listened to, the mini dramas are inserted as part of the release. This means that the main selling point or feature of the disc is the soundtrack, vocal track (character song). A typical track-list would then look like this:
"01 - Vocal track
02 - Mini Drama
03 - Vocal track (instrumental)"
With the drama tracks, they are the opposite. So, the release would be comprised of a collection of these, with occasional vocal or soundtracks inserted.
Again, this is based on what I've seen only.
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