Isn't this a manga?
Viewing post in I Want to Pursue the Mean Side Character! comments
there is a manga that features a heroine x villainess story! It’s called “I favor the Villainess!” The designs are pretty similar (as I did base Beatrix and Lily design off typical villainess type and heroines types; blonde curly hair and black straight hair) but the story is different. But if you’re interested in more heroine x villainess stories, I totally recommend reading that manga too!