Its just my guess but spoiler just in case . . . . . . . . . . . . . . . . . . . . . . .
Seeing in chapter 23 that the demon king appears to be female and the fl's dad/guardian had an older brother who has died/gone missing. I think Bunny is the daughter of the demon king and the older brother. I feel like she will be biologically related to this family.
Its just my guess but spoiler just in case
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Seeing in chapter 23 that the demon king appears to be female and the fl's dad/guardian had an older brother who has died/gone missing. I think Bunny is the daughter of the demon king and the older brother. I feel like she will be biologically related to this family.