The I/O drama CD (Overbrowse Damsel) mentions another drama called "Danse Chasma" that appears to have been released through Regista's website. The only thing I can find from searching the name is a wikiwand page for Ea's seiyuu mentioning it, so it's probably lost media.

It's also mentioned on Sakuya's seiyuu's wikipedia page, which is certainly an interesting combo of characters