Seven Deadly Sins

Alright so I have this idea for a story but I don't know if it would be good. So here's the plot:

There are seven boys and one of them, everyday for a week, wake up with one of the seven deadly sins some where on their face. After seeing their tattoos they go to tell their parents they didnt do it or, something of the sort, and realize they r the only ones who can c the tattoos... Until they meet one another. Then they meet someone with a different kind of "invisible" tattoo. He leads them to another world where they...

So, as always, comments and opinions r VERY welcome...

P.S.- the sin they get kinda describe their personality...