This is Marisa Kirisame's theme from Touhou 8: Imperishable Night
Marisa's always been a fan favourite. But her patterns are so nonsensical.
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Artist: とりこ@バンドを組んだぜ!!!
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=33636876
Home » プレイリスト » Youtube » IN Marisa's Theme: Love-coloured Master Spark (Re-Extended)