As part of their schooling, each student will be paired with a partner of the opposite sex for further training. Saki's classmate Ryou is interested in partnering with her, but as Saki realizes that he is not who she thought him to be, she turns him down and pairs up with Satoru instead. While talking to their friends, Saki realizes that their memories were altered so they recognize Ryou as a regular member of the group since childhood instead of Shun, whose name they can't manage to remember. Mamoru starts remembering Reiko, a girl they used to know when they were little, but cannot recall her name either. Saki finds a mirror in an old crate, which when polished reveals the name Yoshimi. This is the name of Saki's older sister, who the children deduce (due to the poor writing on the mirror) had poor control over her powers and was thus eliminated. Mamoru begins to panic, so Saki, Satoru and Maria decide to keep investigating by themselves without him, but soon after they are called for an audience with Satoru's grandmother Tomiko, who is revealed to be the head of the Ethics Committee, a fact that not even Satoru was aware of.