Board Thread:News and Announcements/@comment-4698889-20180724122634/@comment-2602:306:CE03:5BC0:F88A:809B:98EB:B0F2-20180724145704

It's possible that "悪の" in this case is not intended to reference the title of the various Evil series, but rather just make the "aku" into an adjective. So instead of the "___ of Evil" it could be "The Evil _____".

It does't seem like these songs are going to be in "chronological" order, at any rate.