Miyuki’s classmate at First High School in Class 1-A. She has been friends with Shizuku since childhood, and they are both honor students with the top grades. From the first time she saw Miyuki at the entrance exams, she has been in awe of Miyuki’s beauty and talent for magic and has long wanted to befriend her. As her last name Mitsui suggests, her family can be traced back to the Elements of Light bloodline, and she specializes in the use of magic that enables her to control light. Outside of being a magician, she is a normal high school student, and has romantic feelings for Tatsuya.