I'm not sure specifically what the 'bruno secret story' is without more context. It could be a personal story about someone named Bruno, perhaps a family secret or an adventure he had.
Well, Bruno and Kamala don't end up together in the comics. There are various plot developments and character dynamics that prevent their romantic union.
The Mars chapters of Mars novels usually referred to the stories of Mars colonies or the survival of Mars humans. These volumes usually described the environment and biological conditions on Mars, as well as the exploration and survival experiences of Martians in these areas. Mars could be used as a main plot background to provide a rich imagination for the novel. In some Martian novels, the Martian scroll could also be used as the main clue to promote the development of the story.
I'm not aware of any movie or book specifically based on a 'Bruno Reidal True Story' without more information. There are so many stories out there that it's hard to say for sure without more context.