I wanted to ask is there any restriction to the story progress if I focus on only one heroine at a time and after completing her entire storyline I move into another heroine?
I wanted to ask is there any restriction to the story progress if I focus on only one heroine at a time and after completing her entire storyline I move into another heroine?
For the most part yes, you can just go in whatever direction peeks your interest, though a lot of LI's require you complete other LI's first. The walkthrough will generally point out when that is the case.
Make sure you complete Lucius's "Control Your Lust", it unlocks a main game mechanic.