This is a pretty fun game about a guy who, by chance, becomes the pimp of a club for monster girls after meeting a grim reaper. It's as ridiculous as it sounds, and that's ok, because it immediately let's you know not to expect good story telling from this game.
The story is there, it exists, but do little more than contextualizing the core mechanics, which are great. Every day you have to buy, train and prostitute your monster girls in order to more efficiently do those things in the future, as well as pay your increasing amounts of weekly debt.
What really makes the game tick though are all the different quirks attached to both the girls and the customers. Every girl comes with certain quirks that can be helpful or harmful to both their training and their work. Clients, on the other hand also have a few quirks to be mindfull of when selecting which girls to use, as these quirks are both preferences on which quirks they prefer the girls to have, status requirements and modifiers that can also help or harm your bottom line.
Art is good, girls are cute and the situations that you can put them through are varied and interesting, as compared to other games that just put different girls in the same positions every time. The dialogues can be a little problematic, not because they're badly written on their own right, they're actually pretty good, but because of the lack of cohesiveness that the progression sistem presents.
The progression of the girls from unwilling slave to cock addict is too quick, and too sudden. Altough I have seen girls reach up to 8 levels in lewdness, the progression only happens in the first 3 levels, with a ridiculous jump between levels 2 and 3 that is very unrealistic, 2 being "It's starting to feel good but I don't want this", and 3 being "100% all dick, all the time, I can't get enough". There is no level that goes "Maybe this isn't so bad" or "Ok, this is actually pretty good", wich can be a little jarring, specially on some of the more reserved girls. After level 3 all further levels serve only to better fit client requirements, wich is fine, but certainly wasted potential.
The other and last negative is the "main" girl, the grim reaper, who's got less personality than some of the monster girls, and whose story is weak and predictable. Since the game is once again not story oriented, there wouldn't be a problem with this if the game didn't make it clear her endind is more important, by giving it not only up to a week of extra gameplay, but also one important event (wich I won't spoil even though you can figure it out on week 1) that undermines pretty much everything both her and you went through during the game. It's mildly frustrating but since you don't really get emotionally invested in her at any point, it doesn't make it any harder to go for the other endings so all in all, not that big a downside.
Everything said, I would recommend you try this if you're into training sims. It's fun, not too long, has a decent new game+ system, and exchanging quirks between the girls to create the ultimate whore is pretty satisfying. Especially when your angel pays off by screwing a rich guy out of 15 million. Definitely worth a play