It's not tagged at the source at all but I am 99% certain this is an original alternate design of Aoki Lapis based on the hairstyle and scarf. The artist also seems to really like Lapis.
So the artist made a second one 2 months after the first one with a few things "corrected" https://twitter.com/nantara3080/status/1785230467777847644 so I'm posting this here in hoped of someone translating the new tidbits that were added.