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SimpleCollecter said:
More specifically, The girl on the right (Name is Eve):
https://yande.re/post/show/695127
If you're asking about the illustrator for Eve, it's Sayugitsuno (さゆぎつの). You can google their Japanese name to find their twitter, homepage, fanbox, and whatnot.

Still hoping a kind soul knows the answer to my question; it's still irking me.