This is Kaguya Houraisan's theme from Touhou 8: Imperishable Night
Definitely a favourite from IN. Much more feminine than History of the Moon, but just as powerful and breathtaking. Of course, she may just be showing off; I don't think she ever really intended to fight you in the first place.
Artist: 鈴蘭 (tag: stari)
Home » プレイリスト » Youtube » IN Kaguya's Theme: Flight of the Bamboo Cutter ~ Lunatic Princess (Re-Extended)