In Chapter 16, Karuta is stuck in her demon form, with no way to change back into her human form, and she asks Watanuki to kill her. Watanuki in response shouts, "So what?!" with tears in his eyes, and he explains that it doesn't matter if she's in her demon form. All that matters is that she's healthy, and he proclaims that he always wants to be with her. It's enough to make Karuta cry too.