Ai Nanasaki (七咲逢) Age: 14-15 Class: 1-B Club: Swimming Team Height: 160 cm Weight: 50 kg Birthday: February 21 Blood type: O

A classmate of Miya's. She is part of their school's girl swimming team. She has a younger brother named Ikuo and is very calm in nature, and humble.

Her story is the fourth arc of the anime.