No, K-ON! did not exist back in the Edo era. Using Mio of K-ON!, this is just a comparison showing the visual “evolution” of anime through the years. I think it is somewhat accurate, especially the 80s and 90s. The 80s are all about the Macross/Robotech type look (see Pineapple’s review) while the 90s went a bit overboard with the eyes. As huge as saucers, it reminds me of Saber Marionette J. If you haven’t seen it, you should. It is a very good anime series.