Had a question about Devil's Casino.

I should start by saying that I learned about THaB like the day before Love Me released. But I see a lot of people in the comments of the song talking about characters, the Greed department, as well as other THaB songs. But it’s not listed on the website, and there’s no link in the description for it. Anyone know if this is part of To Hell and Back or not? Thanks in advance!