Tomoki Anzai Edit
Tomoki cheated on Mizuki with her, because it meant nothing to him. Aya told Mizuki about it. Tomoki thought everything would be okay, if he just apologized once Mizuki found out. But Mizuki noticed that Aya is in love with him, asked him to take responsibility for it, and broke up with him. When Mizuki got in accident, Aya regretted what she did, and the fact, that she told about it Mizuki.
Behind the scenes Edit
In the movie she is portrayed by actress Sakura.