I don't know what made me watch this show. I really shouldn't have. I could think of a hundred much better ways of spending 288 minutes of my life (at least one of which would be thinking of 99 other ways), other than watching this awful pedophilia-themed snore-inducing train wreck of a show. Some spoilers to follow, should you care.
You see that summary up at the top of the page? That's the entire plot. There is no development at all besides what is in that paragraph. Naoya, the 23 year old guy who looks like he's about 14 and is voiced by a girl, is taken from his world to be employed as a member of a 10-year old girl's harem so that she can drink his sperm every day. She hates men and is Rie Kugimiya. They pretend to have a plot near the end where the portal to the monster world is trying to erase Naoya and his daughter, so it starts with them losing their voices, but it seems by the very next episode the creators forgot that the characters were supposed to not be able to hear one another and just went ahead with it anyhow. So if you're not watching for the plot, it's gotta be something else, right?
It's not that bad. If you're a pedophile. Every 5 minutes or so you get some sort of phallic imagery alongside the underaged characters. Nothing else really stands out. It's just dull and unimpressive. So if you're not watching for the art, it's gotta be something else, right?
Rie Kugimiya can die in a fire. I really, really hate her voice. A few times in this show I actually just muted and watched it silent for a while because her screams make me that angry. That, and every character has a high, squeaky voice. The OP/ED are forgettable and uninspired, and the only voice I liked was that of the mosquito in the last episode. Unless you're watching for the assorted squeaks of Japan you could otherwise find in a bale of laboratory mice, it's gotta be for something else, right?
Here's where my real beef with the show stands. You find out eventually that Naoya was actually taken to the land of monsters years ago (11 years to be exact), when he was 12, and while he was 12, impregnated the queen, the result of which is his daughter Asuha. I'm not sure if they ever address it directly, but that makes her step-sisters with the princess Astarotte. But then they go to the same school later, and sit together in the same class. That makes them the same age, or at most 9 months apart which would mean more likely than not they would belong in separate classes. Therefore we can only conclude they were born at the same time, suggesting fraternal twins (clearly not identical, one is blonde and the other is blue). In the two characters biographies, it's written that Asuha is the older sister and Astarotte is the younger, but both are 10 years old. Therefore... Naoya must also be Astarotte's father. Which puts a pretty interest twist on things when he is taken back into the land of monsters to provide a faucet for her succubus necessities. By episode 12, he even says to her that he's fallen in love with her. He KNOWS that she's at the most distant, his step-daughter. And yet he's there for that very purpose anyhow. What is WRONG with you, Japan?
I found many other better things to do while watching this show.
I would have given this show a 1, but I don't feel any show can ever match the only show I've ever given a 1 - Shingetsutan Tsukihime. That is, I would have given it at 1, if a Tsukihime anime even existed. So unless you've already made your list of a hundred things you could do with 288 minutes that would be better than watching this show and are looking for something further to do, stick away from this miserable, steaming, heap of crap.