All the characters' voices are fully AI generated, and AI was used for keyframe interpolation to create more smooth animations. Everything else you see is posed 3D models lit in Daz3D similar to many other Visual Novels. Hope that answers your question!
It does, thank you for answering. Are there any plans on replacing the voices with real voice actors? As it stands the voices all sound very monotone and tinny, and I think it would greatly improve the quality of your game if you hired real voice actors. But I understand if it's not within your budget to do so.
I will look into it but I think most likely answer is that it's not realistic. Finding 10+ professional male voice actors that deliver a consistent performance and who all suit the characters, that are willing to do very explicit adult content for a relatively low price, I just dont think is possible. It would also mean all the characters' voices drastically change from the first to second game which isn't ideal for continuity.