Since I'm bothering to tag her, I might as well mention here that the doctor popped up before in the full version of the EX chapter from a good while back. Her name's Azuma Chitose, and she's Mihari's senpai who worked with Mihari to make her gender-bender drugs. She has connections, and is probably the reason why Mahiro can even attend school again. We barely know anything about her right now, so it's good to see her finally appearing in the main story.