A girl that had belonged to Arita's group. She harbours a deep crush for him, even copying a photo at Guam of Arita. Hades had tricked Hikari into writing messages directed at Arita making him paranoid, she however was told that if she didn't, Arita would 'do something bad', while writing one of the messages in the morning she is later killed, possibly strangled, to death by Arita