Aya (アヤ, Aya), called Aya-chan by her friends, is a classmate of Takahata Shun. She appears in the first chapter. She, Shun and the rest of the class witness their sensei's death and are then forced to play Daruma Ga Koronda, Aya quickly notices the timer the Daruma doll and announces to the others that she will stop it but in her attempt to stop the countdown her finger is caught on Satake's bag; to her dismay, the bag falls and she is immediately killed. Satake, losing his mind, runs towards her decapitated body and is also killed.
She is the most attractive girl in class, and both Shun and his classmate Satake seem to like her.