Lapis will probably not become a villainess.
As seen in the beginning people are talking about Lapis, some were talking about her summoning dragon type familiar and some were saying if she failed it would be amusing, this happens alot when it comes to nobles, actors, president etc. That cause pressure to Lapis which probably lead her to make some bad decisions to reach the expectations of people. As we can see in Lapis character she lacks a friend (or girlfriend) that will support her and approach her not just because she's noble and make her feel comfortable and that not everyone is after her throat or something.
Mitori just needs to there for Lapis to prevent her from becoming a villainess. But the games system might make things hard for Mitori or something.
I'll still enjoy this.
