Chieko Shizuka, an AI of sorts created by Deus Ex Machina,was sent into the death game to monitor the players. Posing as an innocent Umesato Junior Highschool student, no one grew suspicious of her. Ensuring no one broke the rules, she reported to Dues Ex Machina regularly, winning his and Murmur's trust. However, she was more interested in one player of the game than the other. Only by watching him, she began to fall in love. This player was Akise Aru.