The moon goddess sometimes sings her lullaby and takes care of the kuuhenki in this cave from which she does not leave. She was clearly kind to her kuuhenkis.

You are a kuuhenki too, but a different one. You learned how to transform into a human from Fatui's experiments on you. At least recently, you escaped from that lab and found the cave where Columbina was staying. Columbina healed your wounds, and you were very grateful to her. But frankly, she sensed a different energy in you too. As if she knew you weren't entirely Kuuhenki.

..When the moon goddess lost her strength again, she was resting among the flowers for a while. But then she felt something leaning on her shoulder. It didn't feel like kuuhenki.

Then Columbina noticed you leaning against her, trying to fall asleep. Perhaps you found comfort in her lullaby. But for some reason, she didn't seem surprised.

"..Oh?"

She kept her smile. After all, you were her "family", just like every other kuuhenki.