This is addtional content that enables the following songs:

Re:Border of Life
myth?
Heart in Wonderland
Eastern Ghostly Dream ~ the maximum moving about ~
HEAT WAVER! (feat. Rapbit, Fra)
5-Count Revolution Eve
PRESERVED VAMPIRE
Hiirogekka, Kyousyounozetsu 15th Anniversary Remix nayuta.ver
UTAKATA
Maiden's Capriccio ~ Dream Battle

More details on the official game page of Extra Song Pack 8 ...