Character profile
Mayumi Shiina
椎名真由美Biography
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.
Story spoilers
Also, she can be a very violent person and once brutally beat up Naoyuki.
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