The charm point of this character is the gap between her adorable cute & moe looks and her scumbag personality. I loved in page 38 how she accidentally discovers the identity of the call girl and immediately thinks about blackmailing her -- and we get to see the faces of her "demon" self and her "angel" self, one smirking with a naughty look and the other bawling like a baby because she can't stand this evil!
After chapter 2, Angel-san must be going "Whew!" in relief.
It looks like, in the end, the gap is not so great. This mc is just a tiny tiny little bit scummy around the edges of a giant goofball of wholesomeness.