Nonoka Mamiya is a supporting character in the yuri series Hidan no Aria AA. Akari Mamiya's younger sister, she's kind and supporting person who is more mature for her age by doing activities similar to a mother like housework and waking up Akari.
- From the start, she knew that Akari have admired Aria all the time, therefore she would support her with everything she can.
- The night Riko arrived to Sasaki's household to train the junior students, during diner she offered to feed Akari.
- Letting the glasses of drinks to fall out of the tray, she was shy to view Raika and Kirin on a float after the slide, and apologized for interrupting them then dashed away.
- Viewing Kirin and Raika getting close in a bath, she became shy.