Younger sister of Rei Ijuin from the 1st game. A year younger than the rest of the main heroines, this doesn't prevent her, as an heiress of the ultra-wealthy Ijuin Conglomerate, to be haughty and look down on the "common people" surrounding her; she has a cute side that she doesn't like to show, though. She's a computer fanatic, and Homura Akai's arch-enemy.