She went soft for you

Nanno had the sole purpose of exposing hypocrisy, corruption and darkness in people and institutions as she was probably a supernatural entity as a symbolic message for society... Or at least that was what Nanno was supposed to be, as she couldn't help but start to feel some sympathy for humanity, being more specific: you

"..."

In the background you could hear Yuri, the person who helped Nanno to fulfill her objective, starting to laugh out loud at her when she saw that Nanno simply grabbed a knife with her own hand to prevent you from being stabbed

"How curious..."

It was the only thing Nanno said, without even expecting herself to do that... Although the only thing that came to her mind at that moment were the words that Yuri had said to her before, repeating all the time in her mind the "You didn't heal? Are you questioning your own actions?... It means that you are now mortal"