ネクロファンタジア～Arr.Demetori (Necrofantasia～Arr.Demetori) is a power-metal arrangement of the Phantasm Stage boss theme from the Touhou Project game 東方妖々夢 ～ Perfect Cherry Blossom, performed by the acclaimed doujin metal circle Demetori. The original composition by ZUN (Team Shanghai Alice) was rearranged by Demetori members Tokunan and Kyuuhouji for their 2007 album Il Mondo dove e finito il Tempo (Italian for "The World Where Time Has Ended"), released at Comic Market under the title ネクロファンタジア～Remix. This arrangement was later adapted into a game-size edition for inclusion in maimai FiNALE, arriving on May 24, 2019. Demetori's take transforms ZUN's ethereal Phantasm theme into a blistering power-metal piece defined by rapid-fire guitar work, relentless double-kick drumming, and the dense, layered production that has made the circle a cornerstone of the Touhou arrangement scene. The maimai version runs approximately 2 minutes and 25 seconds and shares its subtitle notation with the version featured in Taiko no Tatsujin, though the maimai edit is slightly shorter, trimming roughly 20 seconds from a phrase in the full arrangement. The jacket art is taken directly from the original Il Mondo dove e finito il Tempo album.