I don't know what the definition of a grindy game is, but I don't think this is it. Without using a single cheat, by day 50 I was able to open all of the photos and have one wet t-shirt contest. Granted, this took a few hours for me, but I was playing a game and not reading a manga. My hardest photo was the stretching photo because between showering and doing my first job in the morning, I wouldn't see all of the ladies in the tennis court area.
I personally found this game entertaining, and I'm really looking forward to the progression on all of the ladies. If I were to bitch about something, it would be how all of the girls actions are the same, apart from when they are passed out drunk. Every massage scene is the same up towel shot. Every drunken masturbation scene in the bath is the same pose. Every hot tub scene is the same except Alison's. That was a nice surprise. The date scenes are all the same, etc, etc. I'm hoping that the girls will be acting differently as they progress down the rabbit hole.
That's my couple of pennies worth, but overall, I have high hopes for this one.
Cheers!
[EDIT] I suppose I cheated at the beginning. I would save scum until I got the highest rate of pay before playing the game.
[EDIT Part Deux] I wanted to give a kudos for adding the drinks from the bar mechanic. Getting a girl passed out by giving her a shot an hour and getting yourself up to five drinks in five hours made it difficult to get some scenes. Having the option of giving the girl triples in two separate drinks helps a lot!