Rakka reacts to Kuu's unexpected departure by becoming deeply depressed, and her charcoal grey wing feathers begin to turn black. Rakka desperately attempts to conceal the change by cutting off her affected feathers, but Reki discovers her condition, comforts Rakka, and shows her how to treat the black spots with an herbal solution to hide them, something Reki learned from her own mentor, Kuramori. Reki tells Rakka that she (Rakka) is "sin-bound," caught up in guilt for past deeds and unable to understand the true meaning of her cocoon dream. Reki reveals that she emerged from her own cocoon in this condition, with black wings and a cocoon dream she could not fully remember, and has been similarly hiding her own black feathers ever since.