Is your story concept good?
Yes.
Simply put it is good, because its yours. That is what makes it good.
Will other people like it? Who knows.
Will you? Only if you put the effort in.
However, I do find that their is one thing that can truly make the difference between making a good story idea, and a great one. And that simply put is how you can sum it up.
Can you sum it up in a sentence? If yes then you got yourself a pretty good story right there.
A concept for a story should never be, again in my opinion so you are perfectly entitled to agree or disagree with me as you see fit, something that cant fit onto the paper in a fortune cookie.
The reason I say this, is because when you start to get overly complex and detailed with your concept, then the rest of the story will start to become overly convoluted and hard to follow.
And to further prove the point of why I believe concepts for stories should be brief, I’ll give a few examples.
Harry Potter: Boy wizard saves world.
Percy Jackson: Greek gods in modern times
Lord of the Rings: Journey to destroy evil magic ring
Wheel of Time: Infinite cycles
Supernatural: Brothers hunt monsters
Every single one these, are fun, interesting and well loved stories. Some of which garner almost cult like following (cough cough Supernatural cough cough I’m one of them). All of them have concepts that are summed up very briefly. That however does not mean that the context of the story cannot be complex. See Wheel of Time.
The point I am trying to make here, and I was also guilty of this, is that most amateur or starting writers, often confuse context for stories with concepts. A concept is something that should always be brief, to the point and able to convey the overall message of the story. After that, you can build the context for it, in whatever way you so choose.
Although this is just my opinion so it could just be me speaking out of my ass.
Eh...