This is Reisen Udongein Inaba's theme from Touhou 8: Imperishable Night
Reisen's theme is a difficult one to describe; it's not my favourite, but I do like it. Especially if I can get my hands on a good arrangement.
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Artist tag: ume_(plumblossom)
http://safebooru.org/index.php?page=post&s=view&id=1090584
Home » プレイリスト » Youtube » IN Reisen's Theme: Lunatic Eyes ~ Invisible Full Moon (Re-Extended)