Author Chapter 2 (Ichikawa Haruko Sakuhinshuu)
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that sunset in the end looks like that image that appears when the lunarians show up in houseki no kuni
she even says something about being broken into powder

..hmm
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@jwanito my thoughts exactly.
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The houseki references in this and then the last few panels of Lunar Funeral are too damn suspect to be a coincidence, Ichikawa