This is Reimu Hakurei's theme from Touhou 8: Imperishable Night
My favourite theme from IN, hands down. However, I always have a hard time finding arrangements that I like.
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Artist: 青冥童子@お仕事応募中 (tag: qingmingtongzi)
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=37192742
Home » プレイリスト » Youtube » IN Reimu's Theme: Maiden's Capriccio ~ Dream Battle (Re-Extended)