An ordinary school, with extraordinary students. The school is perfectly normal, and so are the other classes. The only exception is Class C13, because every student in it is a tomb raider.
Why raid tombs?
Because it's fun.
Why go on adventures?
Because we want to.
Where did we learn the skills?
Our parents taught us, or we taught ourselves.
That's right, their parents are tomb raiders...
No, we're different from them! We're explorers, treasure seekers.