Well, three girls and one guy.
Mathematics dictate then that 75% of all scenes must have a girl and only 25% must have a guy.
Seriously though, I like this VN. It's light, no drama, no strange stuff, just 4 normal people getting into interacting together. Reminds me a lot of Triangle but that did have a very, very, slightly creepy angle (the young girl being dependent on the couple) which was handled very nicely in Triangle but which is completely absent here.
I like the pacing as well, but since the last version I played was 0.5, I thought the story would have gotten a bit further. But I think it's fine, everybody is a bit shy, nobody wants to rush, and to be fair: why should they rush anything?
And I think that especially Katie is really hot. All of it: face, body, personality.