Strike the Blood, Vol. 9 (light novel)

Blue Elysium is a newlyconstructed, additional manmade isle off the Demon Sanctuary of Itogami Island:the latest, greatest resort, boasting pools, and an amusement park! Yaze schemesto invite Kojou and the others to the isle before its public opening, butsomehow the "free" trip lands Kojou in a horrid part-timejob.
Meanwhile,Sayaka Kirasaka, Shamanic War Dancer of the Lion King Agency, visits BlueElysium as well. Her mission: to rescue the mysterious girl Yume, held captiveinside a research facility. But, an unknown Attack Mage appears before Sayaka, a"Priestess of the Six Blades" using the same techniques asYukina!