If you're looking for a major flaw, well it's right at the center of the story: The protagonist is a rotten spoiled brat. The premise of the story hinges on that, in fact. She runs away from home and ends up living in a house with 3 guys (reverse harem), but in reality there is no reason for her to run away from home as everyone loves her and wants her back. But no, the protagonist is an egotistical brat that will have her way no matter what.
Speaking of having her way, she meets a girl who she ires and the girl immediately becomes friends with her, is very kind to her, gives her a makeover and pays for all the clothes etc.... What does our heroine do? Go for the guy that the other girl loves of course! Forget about the fact that this girl has explicitly told her she's loved this guy forever.
There is a guy who is in love with the protagonist but keeps getting rejected. When he finally says enough is enough and tries to get over her, the protagonist is seriously displeased and sad at this, despite the fact that she is in love with someone else and has no feelings for this person. Yup, the protagonist is the kind of girl that wants to keep these guys bound to her. In general, every character in this manga is serving as a "courtier" to the main girl. It's as if they have none of their own lives, wants or desires, it is all about her her her, and everyone else is a cardboard cutout.
The only positive thing I can say about this story is that it reads relatively quickly and it is not boring. I am not exactly sure how the mangaka managed to turn an annoying storyline with idiotic characters and no justice at all, just a puffed up female lead into something other than boring, but somehow she did. That's some talent right there. Still, I do not recommend you read this. It might not be particularly boring, but it sure is very annoying and completely unrealistic.