Skip this novel. Seriously; go read Log Horizon, Mushoku Tensei or Tate no yuusha instead. This one is just a bad, sad take on the virtual MMORPG/ rebirth in a new world genre. Slight SPOILERS ahead.
If I had to choose the one thing that makes this novel a good choice for garden manure, it would be that the author seems to be too lazy to flesh out the world and the characters himself. Upon checking his page, I saw that this was his only publication according to MAL. In this case I can only hope he matures as a writer in his next attempt. Everything just falls into place in this novel like a jigsaw puzzle because it is expected that it would. The game system is weird and intrusive, rewarding the character for doing anything other than simply breathing. The guy is automatically one of the most powerful people there. There isn't even some power to master or some trial to overcome. The guy just is all-powerful. He takes down a dragon God in the second chapter and becomes an extremely overpowered guy the very instant he wakes up. We learn next to nothing about the city, but it's all fine because there is nothing here we need not expect. There are slaves (there always are); there is magic (to be fair, there is a system involved but its not well-explained) and there are demons (how else can the OP MC do anything)
Most of the time, I found myself filling in for the author from other, better series. It wasn't even that funny.
Next, onto characters. I'm going to take the unconventional route and start with the women in this novel. Never have I felt more sorry for characters in a fictional world. Most of the women are cute, big-breasted (obviously) and eager to talk but sadly unavailable. The women who are available are either lolis or flat-chested or both. Would it have hurt to make some sort of well-defined character. I still don't know anything about the personalities of any of the female characters. I'm not even too sure about the female knight in the second chapter because she was always far too shy. I couldn't even properly empathize with Arisa's story in the third chapter. There's too many vague factors, we don't see Arisa work hard for her country once and the ordinary LN style narration did not help. The MC is detestable. At one point, he didn't land the killing blow on a demon in the city and the author brushed it off by saying something to the effect of "Well, I couldn't really do that, you know?" I get it. Modern men are mostly not used to killing and bloodshed and would be hesitant to kill something, even a confirmed demon. However, the author should not be allowed to explain this away so easily. Put some weight behind the words for god's sake. This is just a rip-off of any other novel in the genre with none of the emotions or strong characters. There is nothing that makes me like this character or respect him. On the contrary, I constantly wished this was a joke and the real MC would appear sometime later.
The art in this work was pretty average and expected of the LN I'd say. Nothing unusual or worthy of praise.
I know I haven't read a lot of the LN; just a little over a volume really. However, I have never been so eager to drop one. Some of the commenters on the website found it enjoyable. If so, I'd like someone to enlighten me about it.
FINAL SCORE: Your princess is in another castle/10.