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It's idea of me or Takano Yuki and Hazumi Rio illustrations are part of a collaboration of them? o.o
I'm not very sure what your meaning is, but Takano Yuki and Hazumi Rio publish doujinshis together for years.
Why doubt whether it is an art book or not, or are the covers of publications together.
takano yuki 的‘小足单翘’系列