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Artist's commentary
"Tsukitsuki"
A sort of evil spirit that appears when the moonlight is strong.
It appears to come from within the moon and circle around it, and this is why it is called "tsukitsuki" which means "that which possesses the moon."
But apparently it isn't really clinging to the moon, it only appears that way to those observing it.
Though it emits a powerful light, it seems harmless.