sakuya being crazy came out of nowhere for me. nothing special happened and then she starts harassing the cafe owner for me and Saito acts like her acting like this is a normal thing and he's terrified of her, when for me she's done absolutely nothing before this to imply that this is usual behavior. when saito realized it was her and said how they're in deep shit now, I actually thought he was talking about minato since at least he was implied to be unstable.
so idk if i missed a route that was supposed to show this more or if the writing for her needs to be fixed up