I thought that the image was a new cover for the album... I was hopeful that Mothy had worked on the OSS novel, but well content is content.
About your question, honestly, I don't know. The characters are obviously from Evillious, by that we should consider them part of Evillious, it's more Banica content after all. Although, the album, and maybe the book itself, is a completely new saga by what the album says.
I think that the difference stands on the universe/world that it happens. It'll be an interdimensional adventure, so it can't be Evillious. Similar to what happened with the Fourth Period and the world of TTDS.
Nonetheless, I think it's best to just discuss and made the changes in content after Mothy confirms the status of the story himself. He will surely do it eventually.