Danbooru-based image board with a specialization in high-quality images.
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ef_~a_fairytale_of_the_two~ hayama_mizuki miyamura_miyako nanao_naru seifuku thighhighs

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Why a drop of sweat is on her head and she has an emotion like that?
Because of Mizuki's hairstyle and uniform (in other words looks like Miyako)
Or rather, in general Mizuki makes everyone sweatdrop around her lol.