This is Persica from Girls' Frontline.
https://iopwiki.com/wiki/Persica
I wasn't sure at first, but since the armband says "16", which references 16Lab, I'm certain it's her. The design seems to be the one from Girls' Frontline 2: Exilium
https://iopwiki.com/images/e/e8/GFL2_Persica.png
This is Persica from Girls' Frontline.
https://iopwiki.com/wiki/Persica
I wasn't sure at first, but since the armband says "16", which references 16Lab, I'm certain it's her. The design seems to be the one from Girls' Frontline 2: Exilium
https://iopwiki.com/images/e/e8/GFL2_Persica.png