The women's names have been changed, and some of them have been altered with different colored hair. The book is actually very tame, and really doesn't contain that much sex. There are also some changes regarding things like there being only 1 chef, in the book there are 3. This game is very obviously partially copied from the above book. The game is far more lewd and seems not to pay that much attention to the mc's main mission which is to create a cheap renewable energy for everyone. I think this part of the story has got lost by 0.29 lol, but on the other hand that kind of makes sense, the author of that book could sue the dev for making a like for game based on his novel if he hasn't given permission, which is not likely.