Anya is unironically and irrevocably Japanese. While most's tastes and approaches to japanese are obviously weeb and their selection of anisongs or 2nd hand exposure to japanese internet music, her tastes are literally indistinguishable to a native speaker and approach the music she enjoys the same way.
To most, Ado is just "haha super popular artist must cover", to Anya she clearly understands the theme of Gira Gira and digests them with ease. Watch her free talk to know more.
https://www.youtube.com/watch?v=ht0wkFWLEN8 