original: ヴワル魔法図書館/ラクトガール ～ 少女密室 [Voile, the Library of Magic/Locked Girl ~ The Girl’s Secret Room]
from: 東方紅魔郷 ~ Embodiment of Scarlet Devil
arrangement: Stack Bros.
album: Shout It Out Loud!!!
There’s no official comment about this song, but it seems that Patchouli found the sealed away, ancient story of a magician that summoned a dragon to bring destruction upon the land in one of her grimoires. It seems as if the written down words were so full of magic, that they practically pulled her consciousness into the book and it feels as if she had really been there.