Thanks for the question.
In harem games, the MC ends up with about 20 or 30 girls and those games follow a certain pattern and come with certain expectations of how they should work. This game is focused on 5 main girls over the course of the game. At the end you can pick one of the girls to be your Queen or there is an option to marry all five main girls and there is a path where the five main girls will share the MC with others, but the harem is limited to five as this game is more focused on story telling and less on porn tropes.
Not that there is anything wrong with harem games or porn tropes, I just didn't want to go that way for this game. I wanted to focus on telling a story with adult content. I hope that clarifies it for you.