Responses

If it's the demon girl, it's not that bad lol. The atory showed that the demon didnt really have her loyalty with the demonkin that's why she readily gave up information after some time because she can't escape. Rose took a liking to her cause they didnt see her as a threat anymore, i guess? Sure there's a possibility of the demon escaping but that's what the mana seal choker was for. Rose is watching over her and also trying to break down her walls so that she will be allies with them. If not, then too bad but they can still defeat her.
I'm already getting annoyed cause I know for a fact, like I can feel it, that this fucking bitch is going to come with them during the adventure, and I SWEAR she will be annoying as fuck
I don't understand why in manga like that with summoning or reincarnation people they fight with have to become their friends, like fuck no go away bitch