Junko Miyaji is Naota's teacher. Like many adults in the series, she acts very immature for her age. She's extremely hyperactive, she overracts to many insignificant occurances in her class, and screams at her class through a makeshift megaphone. She's also the frequent victim of the Medical Mechanica robots that sprout from Naota's head, having her car destroyed twice by both Canti and the Terminal Core.