First I played Koikatsu version. I didn't like it much. Girls were not pretty and there was just bit too much grind.
Then I tested this and wow, what an change good graphics and animations can do to the game.
Teacher is perhaps hottest woman I've ever seen in these games (previously Elven Queen from Long Live the Princess held first place). Sam might climb into top ten as well. All girls have just perfect bodies, slender with good tits and nice looking pussies. And scenes are so lusty and hot. Text to go with animations increases the hotness nicely. The amount of sex and bodily fluids is ridiculous at times, but let's not mind about that.
There's still bit grind, but even that got much better when we got direct routes to some locations. If only there'd be button to jump back home from any location then grind would be almost minimized. Now you'll have to click half dozen times to get from library to home, for example.
I'm quite curious to see how MC introduces girls of the harem to each others as it seems obvious that they're all going to move with him at some point.