This is peak eroge/h-games quite honestly. Not really much more to add from that honestly, but I'll add a bit more of my thoughts.
Coming off from the first game with Aino, this game starts you from scratch with a new pair or protags in MC-kun and Nova, a hot-head gal type of AI, who is entirely the opposite of how Aino was in the previous game. As such, she tends to actually have more plot built around her character, motivations, and interactions with the MC than Aino ever really did. I really enjoy the interactions between the two, because of how much character it gives our heroine outside of just being a sex AI robot.
All 3 routes were satisfying to play through story wise, along with their corresponding outfits and H-scenes which are all animated beautifully. Not to spoil the ending, but after completing all 3, the story manages to incorporate the previous game plot into the story, which was a nice touch for me personally. Some of the fights, especially one of the church side-story fights, were challenging to complete, which give more legitimacy to the "game" side of this product.
Overall 5/5 for me, which is not something I give out lightly. I hope the dev team that made this, continues to pump out more high quality games like this.