Nina Rottol is an underling of the duke. She's a consul candidate which was sent to Muno territory along with the letter from the lord duke 5 years ago.
Muno City arc
She put in the gaol, for more than one year, by demon consul to carry out his conspiracy before she was appointed by Baron Muno. The demon use mind magic to manipulate everybody's memory in Muno Castle, as a result they forgot about her. After saved by Satou, she suggest to Baron Muno to offer Satou a noble rank, honorary knight title. Although at first Satou refused but in the end he gave up and accepted the offer.
- It's seem she's under impression that Satou only has interest in little girls