The original song is Flowering Nights, Sakuya's theme. Night of Nights is a remix arranged by BeatMARIO, a member in the group COOL&CREATE
Touhou is a Japanese doujin game series focused on "Danmaku" or bullet hell shooters. The game this is from is Touhou, 東方花映塚 ～ Phantasmagoria of Flower View
EDIT: mediafire is gay now
Download link (fixed): http://www.sendspace.com/file/gouv9l
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Sakuya Izayoi is a villain who made her debut in the sixth installment of the Touhou Project...