Japenese review of the game can be found here:
http://www.ota-suke.jp/product/review/12351
Why should you care? It contains details of what each of the 8 characters routes will involve.
In each characters information section theres a line in square brackets and a few lines after which contain the relevent information
Heres what Atlas comes up with for the red head cover girl:
? content of guidance: Body dilation guidance
Remarks that enlarge breast and Flesh of the ass, and guide it as service slave who used his that body: Virgin