For anyone watching Psycho-Pass 2 (or maybe it’s just Chapel) Mika Shimotsuki is one of the schoolgirls from season one. She feels a personal attachment to Yayoi because she comforted her during the incident and she’s probably most of the reason Mika became an inspector. It’s why she addresses Yayoi as Yayoi-san, but she drops the honorfics with the other enforcers.
Also in this latest episode, the opening has a lot of digital artifacting now.