Technically, this is actually a Touhou Cannonball doujinshi. Shame no one will ever be able to enjoy having a cute Youmu in a cute Japanese maid outfit ever again. https://www.youtube.com/watch?v=NcTRm7hzMqA
If you've enjoyed this work, I strongly encourage you to show your support to the artist by checking out their other works available for purchase at melonbooks and following them on pixiv and twitter.
Thank you to orasmase and Reidge for pointing out discrepancies with the gallery. Removed the redundant pages and uploaded page 26.