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Artist's commentary
At first I wondered if it was owing the influence of the grand festival at "Dazaifu Tenman-gū":http://http://en.wikipedia.org/wiki/Dazaifu_Tenman-gū, but however I considered it, this was the cause. The tour cost was cheaper, about ￥10,000 in all, which was super-mysterious. :-)
Today starts the Dai⑨shu Touhou Fest chapter. I have a hunch it'll be an eat-'til-you-drop tale, after all!