Mayumi Shiina

椎名真由美

She is Enomoto's colleague who is also connected with protecting Kana at all costs. She impersonates the school nurse at Naoyuki's school in order to keep an eye on Kana, though she really does seem to have some knowledge about medicine. Also, she can be a very violent person and once brutally beat up Naoyuki after they had a talk about Kana.