This causes Hanabi to chase after her and declare that while she isn't in love with Sanae, she still cares about her and wants desperately to remain friends.
While she's not in love with Sanae, she does find her attractive and clearly enjoys fooling around with her. She wanted to be in Mugi's "world", but he didn't let her. Still, Noriko had to drop most of the self-image she built around herself to achieve a response from Mugi, but she took it too far off from the image Mugi had of her, making him back off. Noriko tells Hanabi that she won their "competition" of sorts by at least being able to love purely and sincerely, something that Hanabi herself was pursuing but never achieved sure, Hanabi went through the more "physical" approach, but she definitely didn't leave "happy" with herself.
Kuzu no Honkai, or Scum's Wish, is a 47 chapter manga series written by Mengo Yokoyari.