Her name is Mihono Jun. She just moved into his apartment complex. The fact that she lives so close to him and has now found out his secret, this will change the events so much.
She thought he was just doing cosplay; went back to her place, she lent him one of her male cosplay outfits to change into. Oh btw she thought his dick was beautiful.
He goes home thinking all is fine. Later at night she messages him saying if he doesn't date her, she'll tell his little brother...
(also I think she was doing stuff with his pantsu? (he left the nurse set there) lol)