Since no one has made a review for this yet, I figured I'd be the first.
The simplest way to describe this is: if Overlord and HxH fuzed together.
For those who don't know, this light novel is written by the same author as Masou Gakuen HxH. As you can expect, just like the author's previous work, this is some ecchi goodness.
As the time I'm writhing this, only one of the volumes is fully translated, so things can still change a lot, but I'll give my review based on that first volume.
The MC is Doumeguri, an anti-social guy who you'll most likely grow found of as you read. He and his class (and aparently his work collegue, who becomes his slave, spoilers, the sex type) have been send to a MMORPG game world after something went wrong with some VR tec and you get the idea.
The reason why I compared this to Overlord is because Doumeguri, unlike his classmates, is not a normal player. He is, in fact, Hellshaft, the final boss.
Most of his classmates beleive that they can go back to their normal lifes if they kill Hellshaft and go through the Gates of Hell in Infermia's Castle. But, Doumeguri's work collegue tells him that, if they do that, their consciousness will not be able to go back and they will die (and there's also something about Doumeguri and his work collegue not being able to respawn after dying). And so, Doumeguri must work as Hellshaft and defeat his classmates until they are all rescued.
Those who know HxH must imagine what type of story this is, and it is just what you think. Volume 1 alone has four (three, depending on how you count them) scenes of the type, all of which are forced on the female part. But, just like it was with HxH, the girls will probably be doing that out of free will soon enough.
I do recomend you check this out, expecially if you've read and liked Masou Gakuen. It gives an Overlord-like feel and it's still on a early enough stage that you can catch up without having to read through a mountain of volumes. And if you're not expecially found of the ecchi genre, I also recomend you try this, or Masou Gakuen, out. You might just find a new interest in that.