Nakano ex machina
How is she this unstoppable
Well, she did tell Miyako to call her as soon as some shady character appeared and talked bullshit about being a club member.
Nakano is very protective of Miyako. There's no way she would let any harm come to Miyako.
Btw and since we're on the subject, I stand by my previously expressed opinion: Nakano is totally falling in love with Miyako but hasn't realized yet.