Ryoko Anno is a fictional character in the novel Battle Royale. She is the caretaker of the orphanage where Shuya Nanahara and Yoshitoki Kuninobu were raised. Kinpatsu Sakamochi states that he informed her personally that Shuya and Yoshitoki's class had been chosen for the program, and when she protested, he raped her. Sakamochi's treatment of Ms. Anno infuriates Shuya and Yoshitoki and motivates them both to fight, but when Yoshitoki threatens Sakamochi, he's executed by government soldiers. 

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