I actually just finished this game yesterday (jp version). Didn't think a translated version would be out this soon. NTR is mostly avoidable, and it even has a non NTR ending. But it's an NTR game, so all the good stuff is obviously in the NTR route. There are a few different options to unlock everything quickly. You can skip dungeon diving in the options so the game can be completed faster. There's even an option in the CG room to unlock all scenes, but I don't know if you can access it at the start or if you have to beat the game first. The options are great, because the game is pretty grindy, despite being short. As for the AI CG, it's not bad, all things considered. If you don't like that, just move on. Complaining isn't going to make it go away.