I'm not sure specifically what the 'coda real story' is as it could be many things. It might be a story related to a person named Coda, or it could be a specific event or experience named such. Without more context, it's hard to say exactly.
Coda is not directly based on a true story. It's more of a fictional narrative crafted by the writer's imagination, although it might incorporate common themes and emotions that people can relate to in real life.