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Went to the kptobukiya store today and they were having a special yotsuba event sale where they were selling 4 different books (I’ve never seen before) and these two are the ones I bought.  On the left, titled drawings is full of cute drawings supposed to be done by yotsuba.  On the right titled illustrations is filled of drawings of characters from the manga, by kiyohiko azuma.  Good purchase!