Yuma hears about the secret of Eiko from Hideaki. Teruko, from Gunma where Eiko spent her childhood, tells Nao about Eiko's childhood. Nao comes to the conclusion that Eiko is the cause of her nightmares. As a child, Eiko was forced to live under house arrest by Kazuyo in the old ward of the new hospital. Since Eiko and Mie are sisters with the same father, Kazuyo planned to replace Mie with Eiko. However, in the old ward, Eiko finds something while exploring...