Honestly yeah, the whole slavery thing feels really forced, especially since Sora became an adventurer super easily without any questions asked (he literally just put a drop of blood in a card which doesn't say his age, and that was it)
Imo, it would've been much better to simply make her an adventurer too, with Sora becoming her senpai and teach her stuff, which could've also reminded him of his early times with the two girls
Just being like "Oh, it's a child without papers? Then she have to become a slave" is just stupid, since if any child lose their paper or is stolen by someone, they would instantaneously become a slave, and that may or may not include nobility since they can't prove their identity, same if they get kidnapped/menaced by someone
It's also stupid because the whole point of the loli was that she was now free of her chains of being a slave assassin, and that she has to learn to not simply take orders, and what does she becomes right after 3 chapters? A slave
But of course, if we do that, we wouldn't have a loli slave, and we can't not have that
I feel like ever since Sora was stalked by the loli, the story became darker and forced for no reason when it was mostly chill adventures and stuff