Danbooru-based image board with a specialization in high-quality images.
akiyama_mio animal_ears dafei dress k-on! nekomimi pantyhose

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Rather sure that is not Mio but a character who only appears in the 1st ED of the second season.
smerrow said:
Rather sure that is not Mio but a character who only appears in the 1st ED of the second season.
It's tagged akiyama_mio on Pixiv and the title of the image is MIO IN THE CAKE. So the artist definitely intended for it to be Mio. (゜ー、゜)
smerrow said:
Rather sure that is not Mio but a character who only appears in the 1st ED of the second season.
No, it's Mio. The character in the ED was an "Alternate Universe" Mio.