I was going to put a 4 stars, but I just finished the game, and I'll stick with 3.
It is a "sandbox" game that for some reasons has 3 gameplay modes.
Story, cheat and sandbox.
What is the difference?
In story, you have tot train your "stepsister's set daughter, absolutely not you suster's daughter, aka your niece" to be your maid or you will kick her out.
And you have to do so before her motivation reach a too low score.
Don't worry, the game hasn't enough content to make that score go too low anyway.
You have 3 categories to train her in. or not, it's actually completely irrelevant to both the story and gameplay.
And you have to increase her love stat. How? Dunno, I got the 27 events, and it wasn't high enough, and you still get good endings when you don't pass the score check so... huh... Meh.
Cheat mode, it's the same but you give even less of a shit about the stats since they all start maxed out.
And sandbox, is a mode where you choose up to two girls and play exclusive scenes outside of the main story.
The story is nice, for once we don't have a creepy perv MC, and turns out we are not the ones doing the corruption but we are the ones being corrupted.
The renders though are plainly ugly.
And this game has something I hat above all, straightening lesbians with huge dicks, because it's a well-known fact that all lesbians need in their lives is a good old big dick for them to realise they are actually bi at worst or straight at best...
Overall, the story is ok, but the gameplay is useless, don't bother training her, just stick with the events since they are the only way to get the good ending.