Game's quite interesting, the lighting and models are great too. But wouldn't it be better if the AI graphics are switched with self-edited stuff or even stock images?
While the sex scenes all use Koikatsu as the previews show, I feel like it gives a bad look for the game to make everything from the story CGs, side character talk sprites, and even the GUI artificially generated. Looks rather lazy and needlessly sloppy considering the background often don't match with the maps you use in Koikatsu... then why not just take screenshots of those Koikatsu maps? I think you understand it too, as none of previews use AI, you wouldn't if you didn't care.
Not to mention, seeing how Goku and other male characters all use mostly existing official artwork, it wouldn't be too difficult to similarly find cropped images of them; or even impose a render of the main character into a stock photo if posing everything in Koikatsu is too much of a time waster.
If you want your story be taken seriously without putting too much effort on the non-sex stuff however, it wouldn't even be that difficult to find a fairly good looking Koikatsu model of Goku, most of the important characters, and maybe the fodders enemies present in the original series like... Ginyu Force, Saibamen or Raditz I guess.
tldr; love the game, but the presentation could be done better and AI-less! Hope those can be slowly phased out as you improve!