I saw a few little spoilers from the next two chapters and... can't wait!
Have to say again, this is a good manga.
It bothers me a bit those shameless fanservice exposing Anjou body "unnecessarily", or her making dumb faces, but whatever, it's minor. Her apparent "slutness" is actually well integrated in the story. She is an open extroverted person and want to teach Seto how to be more open because she believes he causing harm to himself being to close and afraid of things.