Sakon realizes that Aki was an accomplice in the murder of Kujou, but is unconvinced that Kouei was the mastermind. Tsubota tells Sakon and Kaoruko how Eimei's mother was forbidden to enter the Kujou school and 10 years ago committed suicide in protest at not being able to see her son, pointing to Eimei as the murderer. However, Eimei is found dead at the bottom of a cliff by Naoto. To Kaoruko's surprise, Sakon eventually reveals that Naoto is the mastermind behind the murders, using Tsubota to help him rid the Kujou school of what he saw as its unworthy successors, enabling him to take over himself. Kaoruko is deeply hurt by Naoto's callous behaviour, but tries not to show it.