While I haven't seen a lot, so far this is my favourite hentai. Mainly carried by its premise and world-building but it's also just kind of fun because of how depraved it is. I love Reika's character because of how unhinged she is, the way she wants to be used is so hot. Even as a sub I thought the sex scenes were a perfect blend of really hot but also really fucked up. The scene in the bathroom in episode 2 especially. I also kind of like the idea of the MCs character development, but because of the lack of episodes it goes waytoo fast and kind of fucks up the pacing. The animation is really great and I love the art a lot. The fantasies this spawned in my head are crazy. Honestly, long story short, its biggest problem is that it should've had more episodes.