Confusing but uniquely vivid.
The author has great talent in composing vivid imagery that gives further insight into the story's themes, and the cadence with which the author writes is so conversationally natural. I just wish there was more on the grammar behind the writing (spelling, overabundance of commas, incorrect usages of m-dashes).
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The setting's premise was definitely intriguing and unique, but the world-building could have been a bit more creative and clear. For example, are there other ways to explain the story's background besides listing it in long sweeps of narration or dialogue?
I also found it hard at times to decipher which character was speaking. And Itsuki suddenly speaks Mikael's name when he's clearly the story's mysterious archetype she's trying to understand (I wish there was more of a discovery behind his name to match the intricacy of the mind which is so prevalent to the story). I was also hoping the ending would revisit the story's main theme of turning away from a black-and-white understanding of the world (hence 'Grayscale'), but I did not find that, other than the brief mention of "gray eye."
Overall, good story. And the author has amazing ways of composing fantastic similes and metaphors I've never read before!