Standard Kagura game to be honest. Not their best, but enjoyable. It's a very standard RPG with basically one dungeon with around 40 levels and a nice story. A bit more linear and repetitive than their other games though (which is part of the reason it's a 4 stars). That said, it's the only game I've seen with a "Level shop" where you can buy levels !!! :-)
As always there's a stat, here is "depravity", that may gives different path depending on the value; the highest means more lewd, but also may mean early ending (either good or bad).
I tend to play their game trying to keep that stat as low as possible and play the game to full extent. In this case, while it's possible, keeping this stat at 0 imply doing something against the persona of the character. You need to NOT help someone because if you do, you can't avoid the Hscene and end up having a stat at 5. While it's far from being a big deal and doesn't change anything, I found it irritating (LOL I'm a sucker for good story and it's the other part of rating 4/5).
Anyhow, after finishing the game, as usual, you can have access to all H scene and enjoy them at will. If you choose to play and explore the lewd content as you go, the "Hall of Memory" has a hint system to help you unlock them. There is no type of "game +" though after you beat the game.