Commissioned by qazmlpok of http://www.touhou-project.com/ For some reason nobody has added this doujinshi yet to Doujinshi DB so I'm linking the circle entry instead.
Please support the circle if you can http://shop.melonbooks.co.jp/shop/detail/212001061989 http://doujinshi.mugimugi.org/browse/circle/47912/brownstone/