A Promise in Silver

Keyfree and Tata take Coco, who has fallen ill, to the hospital. Tata has become suspicious of Keyfree's recent behavior and tries to confront him about it, but he evades her questions. Meanwhile, she learns that Coco, despite being an "unknown," has become Keyfree's apprentice, and she feels a complex mix of emotions as she relates it to her own situation as someone with "silver-colored disease." That night, while Keyfree is busy responding to a fire in the town, Tata searches the medicine storage room for a drug that is difficult to distinguish by anything other than color in order to save Coco, whose condition has worsened.