Well I was thinking about it being just a normal day. At night they sneak out and find out that the duke and duchess are trying to destroy everything and then they have to stop it or just continue following orders from them. If they want to stop them, the have to find and hide the items that summon the spirit. They might have to battle the duke and duchess and (possibly) kill them in order for the kingdom to be safe. If they want to follow orders they will basically see the end of their kingdom and the death of innocent people. So I guess it's an adventure type with finding everything and trying to bring down the Duke and Duchess.