So, we finally getting somewhere. Kasen can already breach the barrier. But whatever her method is doesn't seem to be very refined. Unlike Yukari that can easily go whereever she pleases with her Parasol.
As usual ZUN keeps a lot of details a total mystery. While making others plainly obvious. What impressed me the most was that even though the Manga is about Kasen. We learn about her trough the other characters talking rather than visually see what she really is capable of.
He might not be the best Mystery author, but he really can write some intruiging stories.
Also, that's where Remilia's disgusted eating face comes from. Haha, it's great!