So is there a reason why none of my brothel girl's overall grades are increasing? Pretty much all of them are stuck at e or f when the grade of their stats is up to d or c. Not a big problem for the uniques but the monstergirls only give out their stat buffs when their overall grade meets a certain level.
The overall rank evaluation requires a certain number of customers per rank as well, even if they're S rank all skills you'll still need I think around 16 customers before they can get the overall S rank when you train them next.
So I figured out what the hidden achievement right under the "S rank brothel" achievement on Ryse's side that was driving me nuts is.
Turns out if enough of your top 6 girls (5/6 as far as I can tell) cater to specific tastes (aka have a specific nature or other criteria), you'll get a little title on the top right of the ranking screen of what your brothel specializes in.
In order of hierarchy, "Brood Parasitism", "Demon King Execs", "Netorare", "Non-Human", "LoliLoli", "Married Women", "Holy Women", "Public Servants"
There's a hierarchy here of which titles would show up if multiple are fulfilled going by the order of the images, I was able to overwrite the Netorare title with the Brood Parasitism title with both criteria fulfilled. The Netorare title also works with either the "Likes Netorare" nature or the annoying "Causal Netorare" title that messes with stuff.
The natures for the last three (Married or Widow, Clergy or God, Public Servant) also only show up when scouting girls, and even then can only show up on specific girls so this isn't something you'd easily come across by accident.
If you get the Brood Parasitism title for your brothel, you unlock the hidden achievement which translates to something like "Original Brood Parasitism Brothel". The description speaks of paving the road to the future. I suppose this means Ryse makes history with this achievement, Butakoma has really been showing a fondness for this fetish since the princess and brood parasitism elf brothel cgs.
