She cosplayed Kaguya for one of those parts, and then cosplayed as Chika for the other.
And she doesn’t just perform it, but also cosplays as both Kaguya and Chika!
Ayasa describes herself as an anime fan, and it looks like she’ll be covering more anisongs while cosplaying through her YouTube channel in the future.
Ayasa isn’t just an accomplished violinist, but she also serves as the seiyuu for Rui Yashio, a violinist for the band Marfonica in BanG Dream!. The seiyuu also has her own YouTube channel, and she recently posted a new video of her playing a violin rendition of KAGUYA-SAMA: LOVE IS WAR Season 2’s OP song, “DADDY!