well at least the harem is not mandatory.....i hope so
No i guess not from what i have played. But some choices are not obvious and can lead to unwanted consequences,
There are just a few variables in the script and you can refuse a girl but it's not that simple. So save often and go back if you get something you don't like like i had to do.
That's why i went trough the script to see what does what exactly.
I loved the game especially Kat, she drives me mad !! but after playing this chapter i'm a bit concerned with the plot. A bit too much intertwined to be believable but well it's just a porn incest game so...