Excellent game with intelligent writing and engaging characters. Definitely one of my top ten.
The story, although seemingly simple at first, starts with the MC, and his sister, Eve, spending a week in their home with the sister's best friend, Cass, in the absence of adult supervision. MC and his sister have been estranged for years due to her alleged slutty behaviour, but soon, Cass, the best friend, reveals that it was just rumors and it might not be too late to mend things between siblings. And of course, the best friend is cute as a button too, and maybe things could evolve in that direction too.
So as you can see, it begins as a pretty classic adult game plot, but what really set Summer Scent apart from other less than good games is that your choices matter. A lot. Most of your choices will give you love/dom/sub points with the girls, and a few other answers will be crucial to lead you toward one route or another.
I've read a lot of players whining complaining about how the game makes you a spineless sub or that it is complicated to follow one route or the other. Well, if you make choices that make your character act like a spineless sub, maybe the fault lies in you? I think it tells more about you than it does about the game being "bad". The need for a walkthrough, although I can understand the fear of missing things, is in my opinion superfluous. There are notifications about the kind of points you earn for each answer, and then you just have to be logical and use your brain. Not the lower one.
In my main playthroughs, I went for the love routes for both girls at the same time, or love route for Cass coupled with Domination route with Eve. And it's really a credit to the game that these playthroughs, although a bit similar when it comes to Cassie's love route, really show two completely different aspects of Eve and the MC in their relationship, while being pretty consistent. I even tested the femdom route with Cassie (not my thing), and it gives you a glimpse of her personality which is also consistent with what you can learn in the love route. Kudo to the author!
Graphically, I have nothing but compliments to give. The graphics are up there, each girl has something that makes her unique (not just the same old model), besides being totes cute, and the general lighting/composition/attention to details is streets ahead compared to most other games.
tl;dr Don't listen to the whining brats and play this gem (without any walkthrough if possible). Just enjoy it!