Type-kun said: This is just a side-effect of Marisa stealing the entire library along with part of basement.
So basically, if Marisa is going to try to plagiarize spiriting-away techniques, she needs to learn about the boundary between the bookcase and the load-bearing wall? Wonder if there's a book she could steal about that...
Fairy Maid #117: "Rebuilding's going to take longer than expected, Mistress Sakuya. I've searched the rubble, and I can't find the blueprints or your copy of the building code."