For everyone that is struggling, you need to use skills picky bounce, critical eye, smile and charm. I usually use charm first, then crit eye, and then picky bounce, and lastly smile.

Warning, it will take a while to get an S score. I'm on chapter 7-2 and stuck. Decided to go back in earlier chapters and get S's in both maidens and princess chapters. Mind you, I was stuck on 4-12 for a good two weeks :I.

I added picky bounce to my skills on got it on my second try. I tried to do it again, after I got the S, just to see if I could get it again and I didn't. So it is about luck, just make sure you have the bunny outfit on and put everything on in every single category that has the attributes of cool, sexy, cute, lively and simple. Even if the item has only one of those attributes, it helps.